Albert I may refer to:

* Albert I of Belgium ( 1875 – 1934 ), third King of the Belgians

* Albert I, Count of Namur ( c. 950 – 1011 ), a Belgian count

* Albert I, Count of Vermandois ( 917 – 987 ), Count of Vermandois

* Albert I, Duke of Brunswick-Lüneburg ( 1236 – 1279 ) second Duke of Brunswick-Lüneburg

* Albert I, Prince of Anhalt-Zerbst ( d. 1316 )

* Albert I, Duke of Prussia ( 1490 – 1568 ), first Duke of Prussia

* Albert I of Germany ( 1255 – 1308 ), King of Germany and Archduke of Austria

* Albert I of Käfernburg ( died 1232 ), Archbishop of Magdeburg

* Albert I, Prince of Monaco ( 1848 – 1922 )

* Albert I Kalonji Ditunga ( born 1919 or 1929 )

* Albert I, the first monkey in outer space ( 1948 )

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Albert the Bear (; c. 1100 – 18 November 1170 ) was the first Margrave of Brandenburg ( as Albert I ) from 1157 to his death and was briefly Duke of Saxony between 1138 and 1142.

Albert was a loyal vassal of his relation, Lothar I, Duke of Saxony, from whom, about 1123, he received the Margraviate of Lusatia, to the east ; after Lothar became King of the Germans, he accompanied him on a disastrous expedition to Bohemia in 1126, when he suffered a short imprisonment.

* Albert III, Margrave of Brandenburg ( 1414 – 1486 )

Three years he was occupied in campaigns against the Slavic Wends, who as pagans were considered fair game, and whose subjugation to Christianity was the aim of the Wendish Crusade of 1147 in which Albert took part ; diplomatic measures were more successful, and by an arrangement made with the last of the Wendish princes of Brandenburg, Pribislav of the Hevelli, Albert secured this district when the prince died in 1150.

It was possibly at this time that Albert was made Arch-Chamberlain of the Empire, an office which afterwards gave the Margraves of Brandenburg the rights of a prince-elector.

Albert's personal qualities won for him the cognomen of the Bear, " not from his looks or qualities, for he was a tall handsome man, but from the cognisance on his shield, an able man, had a quick eye as well as a strong hand, and could pick what way was straightest among crooked things, was the shining figure and the great man of the North in his day, got much in the North and kept it, got Brandenburg for one there, a conspicuous country ever since ," says Carlyle, who called Albert " a restless, much-managing, wide-warring man.

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Albert's titles ( on his proclamation of 1561 in Königsberg ) were: Albert the Elder, Margrave of Brandenburg in Prussia, Stettin in Pomerania, Duke of the Kashubians, and Wends, Burgrave of Nuremberg, and Count of Rügen etc ..

* Albert Achilles, Elector of Brandenburg, ( 1414 – 1486 )

However, Albert inherited the Margraviate of Brandenburg from its last Wendish ruler, Pribislav, in 1157, and became the first Ascanian margrave.

Frederick I of Ansbach and Bayreuth ( also known as Frederick V ; or ; 8 May 1460 – 4 April 1536 ) was born at Ansbach as the eldest son of the Albert III, Margrave of Brandenburg by his second wife Anna, daughter of Frederick II, Elector of Saxony.

* Albert III, Elector of Brandenburg and Margrave of Brandenburg-Ansbach

* 1440: Albert I / I / III Achilles ( son of, also Margrave of Brandenburg-Kulmbach and Elector of Brandenburg )

* 1457: Albert I / I / III Achilles ( also Margrave of Brandenburg-Ansbach and Elector of Brandenburg )

In 1577 the Brandenburg electors became co-regent with Duke Albert Frederick of Prussia.

John Cicero was the eldest son of Elector Albert III Achilles of Brandenburg with his first wife Margaret of Baden.

In Kruszwica on 6 January 1148 Judith married Otto, eldest son of Albert the Bear, the first Margrave of Brandenburg.

He never married or had children ; because his brother Henry died before him ( in 1192 ) also without issue, after Otto II's death in 1205 Brandenburg was inherited by his younger half-brother Albert II, son of Otto I and Ada.

In 1517, it was believed that all of the money that Tetzel was trying to raise was for the ongoing reconstruction of St. Peter's Basilica, though half the money went towards helping the Archbishop of Mainz, Albert of Brandenburg, under whose authority Tetzel was operating, to pay off the debts he had incurred in securing the agreement of the Pope to his acquisition of the Archbishopric.

The Teutonic Order fell into decline following its defeat in the Battle of Grunwald in 1410 and the secularization of its Prussian territories by Albert of Brandenburg in 1525, but the Livonian Order managed to maintain an independent existence.

She was the daughter of John Sigismund, Elector of Brandenburg, and Anna, Duchess of Prussia, daughter of Albert Frederick, Duke of Prussia.

After the death of Albert Frederick, Duke of Prussia in 1618, his son-in-law John Sigismund, Margrave of Brandenburg, inherited the duchy, including the lake-region ( later Masuria ), combining the two territories under a single dynasty and forming Brandenburg-Prussia.