This view is based on the fact that Thietmar of Merseburg in his chronicles named Gunzelin, Gunther's son, brother of Bolesław I the Brave, Dobrawa's son.

Counts Bernard and Thietmar marched against the fortress of Lenzen beyond the Elbe, and, after fierce fighting, completely routed the enemy on 4 September 929.

The chronicle of Thietmar poses some problems of interpretation of the information regarding the attack of Margrave Gero on the Slavic tribes, as a result of which he purportedly subordinated to the authority of the Emperor Lusatia and the Selpuli ( meaning the Słupian tribes ) and also Mieszko with his subjects.

Although Thietmar made no mention of warfare that possibly took place on this occasion, the information on the return of the accord, acting for the good of the country and release of prisoners indicate that a conflict actually did occur.

Also, a theory exists ( apparently based on Thietmar and supported by Oswald Balzer in 1895 ) that Vladivoj, who ruled as Duke of Bohemia in 1002 – 1003, was a son of Mieszko and Dobrawa.

The first known historic record comes from 1010, in Thietmar of Merseburg's chronicles, after the troops of King Henry II of Germany in the conflict over the March of Lusatia and the Milceni lands had attacked the forces of the Polish Duke Bolesław I Chrobry and again besieged Glogua on August 9, 1017 without result.

According to the chronicles of Thietmar of Merseburg, Otto III, who had been a friend of Adalbert, committed to a pilgrimage from Italy to St. Adalbert's tomb in Gniezno ; in his attempt to extend the influence of Christianity in Eastern Europe, and to renew the Holy Roman Empire based on a federal concept (" renovatio Imperii Romanorum ") with the Polish and Hungarian duchies upgraded to eastern federati of the empire.

The contemporary German chronicler Thietmar of Merseburg, generally ill disposed towards Poles, on this occasion commented on the bravery and skill of the defenders, noting that they neither cheered when they were successful, nor lamented when they suffered a setback.

Thietmar, the principal German chronicler of the time, did not give precise details as to the conditions on which Boleslaw retained these lands.

The contemporary German chronicler Thietmar, who was generally ill disposed towards Poles, commented on the peace with the words " non ut decuit sed sicut fieri potuit ", meaning " not as it should have been but as was possible in the circumstances ".

" Orchard points out that Adam's description of the temple has often been questioned " on several levels " and that Thietmar of Merseburg produced a considerably less detailed but similar account of sacrifices held in Lejre, Denmark earlier in the 11th century.

There is another version on the origin of Holy Crown, which is a popular fallacy: Thietmar von Merseburg ( died in 1018 ) reports that Otto III of the Holy Roman Empire has consented to the coronation of St. Stephen, and the Pope is sending his blessings ; so many historians argued he has also sent a crown, however, does not report on any crown, so it cannot follow any fact.

The German historian Thietmar, Count of Merseburg wrote that the Daner had their main cult centre on Zealand at Lejre, where they gathered every nine years and sacrificed 99 people but also horses, dogs and hens.

According to Thietmar of Merseburg, Bruno died in a flooded river while on campaign against the Danes in 880.

The primary chronicle sources for Gero's life are those of Widukind of Corvey and Thietmar of Merseburg, on which most of the work in the secondary sources is based.

According the German chronicler Bishop Thietmar of Merseburg, the decades long forced Germanization and Christianization of the Slavs associated with these two churches was the reason for their destruction.

According to Thietmar, this was the most sacred place in the land of pagan Slavs, and Svarožič was their most important deity.

Tangermünde can look back at a thousand-year-long history as already in 1009 the medieval chronicler Bishop Thietmar of Merseburg referred to a local lowland castle, which probably had been erected in the early 10th century during the rule of King Henry the Fowler at the border with the lands of the Polabian Slavs incorporated into the Saxon Marca Geronis.

Also, a theory has been advanced ( apparently recorded by Thietmar and supported by Oswald Balzer in 1895 ) that Vladivoj, who ruled as Duke of Bohemia during 1002 – 1003, was another son of Dobrawa and Mieszko I.

There is a surviving report of the ceremony by Widukind of Corvey which makes no mention of his wife having been crowned at this point, but according to Thietmar of Merseburg's chronicle Eadgyth was nevertheless anointed as queen, albeit in a separate ceremony.

Leipzig was first documented in 1015 in the chronicles of Bishop Thietmar of Merseburg and endowed with city and market privileges in 1165 by Otto the Rich.

More precise contemporary records regarding Mieszko were compiled by Widukind of Corvey, and half a century later, by Bishop Thietmar of Merseburg.

According to Thietmar and other contemporary chronicles the gift given by Mieszko to the Emperor was a camel.

Possibly Mieszko took the region before 990, which is indicated by the vague remark of Thietmar, who wrote of a country taken by Mieszko from Boleslav.

Thietmar of Merseburg says that the first archbishop of Magdeburg, Saint Adalbert of Magdeburg, before being promoted to this high rank, was sent by Emperor Otto to the country of the Rus ' ( Rusciae ) as a simple bishop but was expelled by pagan allies of Svyatoslav I.

The chronicle of Thietmar of Merseburg, who died in 1018, could have been regarded as the only contemporary and unbiased account of events, if it were not for the fact that Thietmar's data could have been supplied by Svyatopolk himself during his brief exile at the Polish court.

But Thietmar states that Boleslaus I of Poland firstly supported his son-in-law against Yaroslav in 1017, which is the date, according to the Russian Primary Chronicle, of Svyatopolk's first defeat by Yaroslav.

The name of the river Spree was by Thietmar of Merseburg recorded as Sprewa ( Middle German sprejen, sprewen, High German sprühen meaning to spray water ).

For the Monumenta Germaniae historica he edited the Chronicon of Thietmar of Merseburg, the Gesta Hammenburgensis ecclesiae pontificum of Adam of Bremen and the Chronica Slavorum of Helmold, with its continuation by Arnold of Lübeck.

According to Thietmar of Merseburg, Svarožič ( Latinized Zuarasici ) was worshipped by a tribe of Ratars in the city of Ridegost ( Rethra ).

Records of the battle are sparse, it was briefly described by the cronicler Thietmar of Merseburg ( 975-1018 ), whose father participated in the battle ( Chronicon II. 19 ), and mentioned by Gallus Anonymus in the 12th-century Gesta principum Polonorum.

According to the chronicle of Thietmar of Merseburg ( 975-1018 ), the name of King Stephen ’ s uncle whose country was occupied by the Hungarian king in 1003 was Procui.

The Slavic settlement of Jutriboc in the Saxon Eastern March was first mentioned in 1007 by Thietmar of Merseburg, chronicler of Archbishop Tagino of Magdeburg.

As Silencia, recorded by Thietmar of Merseburg, or Silesia, the Latin version, was in earlier German sources written as Slesia, from which developed the High German version Schlesien.

In the year 1002 the city of Bautzen was first mentioned by Thietmar of Merseburg.

The first is the chronicles of Thietmar, who was born two years before the death of Dobrawa.

Major works include a chronicle of Thietmar of Merseburg from the beginning of the 11th century, who described a temple in the city of Riedegost ( Radegast ) where the great deity Zuarasic ( Svarožič ) was worshipped.

According to Thietmar of Merseburg a reconciliation with the Frisians was arranged with help from his uncle in-law, king Henry II, who travelled with an army from Utrecht to quell the frisian revolt.

According to Thietmar of Merseburg, Géza continued to worship pagan gods ; a chronicle claims that when he was questioned about this he stated he is rich enough to sacrifice to both the old gods and the new one.

Thietmar of Merseburg first mentioned the site as Salsa Cholbergiensis.

During Polish rule of the area in the late 10th century, the chronicle of Thietmar of Merseburg ( 975-1018 ) mentions salsa Cholbergiensis as the see of the Diocese of Kołobrzeg, set up during the Congress of Gniezno in 1000 and placed under the Archdiocese of Gniezno.

Due to the death of Thietmar of Merseburg, the principal chronicler of that period, there is little information about Mieszko II's life from 1018 until 1025, when he finally took over the government of Poland.

According to the majority of modern historians, Thietmar made an error summarizing the chronicle of Widukind, placing the Gero raid there instead of the fighting that Mieszko conducted at that time against Wichmann the Younger.

Likewise chronicler Thietmar attributes Mieszko's conversion to Dobrawa's influence.

Mieszko's conflict with Odo I was a surprising event because, according to Thietmar, Mieszko respected the Margrave highly.

Lesser Poland supposedly after its incorporation had become the partition of the country assigned to Mieszko's oldest son, Bolesław, which is indirectly indicated in the chronicle of Thietmar.

According to Thietmar the Polish ruler died in an old age, overcame with fever.

According to Thietmar Mieszko I divided his state before his death among a number of princes.

Thietmar of Merseburg became the first bishop of the newly-created bishopric of Prague in Bohemia, appointed in 973.

However, according to the chronicler Thietmar, she was not the virgo desiderata, the anticipated imperial princess.