Ambrosius Aurelianus, ; called Aurelius Ambrosius in the Historia Regum Britanniae and elsewhere, was a war leader of the Romano-British who won an important battle against the Anglo-Saxons in the 5th century, according to Gildas.

This is perhaps a generation before the battle that Gildas says were commanded by Ambrosius Aurelianus.

" In Chapter 48 Ambrosius Aurelianus is described as " king among all the kings of the British nation ".

Ambrosius Aurelianus appears in later pseudo-chronicle tradition beginning with Geoffrey's Historiae Regum Britanniae with the slightly garbled name Aurelius Ambrosius, now presented as son of a King Constantine.

If this etymology is combined with the tradition reported by Geoffrey of Monmouth stating that Ambrosius Aurelianus ordered the building of Stonehenge – which is located within the parish of Amesbury ( and where Ambrosius was supposedly buried ) – and with the presence of an Iron Age hill fort also in that parish, then it may be tempting to connect Ambrosius with Amesbury.

In Alfred Duggan's Conscience of the King, a historical novel about Cerdic, founder of the Anglo-Saxon kingdom of Wessex, Ambrosius Aurelianus is a Romano-British general who rose independently to military power, forming alliances with various British kings and setting out to drive the invading Saxons from Britain.

In Valerio Massimo Manfredi's The Last Legion, Aurelianus ( here called " Aurelianus Ambrosius Ventidius ") is a major character and is shown as one of the last loyal Romans, going to enormous lengths for his boy emperor Romulus Augustus, whose power has been wrested by the barbarian Odoacer.

In Rosemary Sutcliff's The Lantern Bearers Prince Ambrosius Aurelianus of Arfon drives out the Saxons by training his British army with Roman techniques and making effective use of cavalry.

In Jack Whyte's Camulod Chronicles, Ambrosius Aurelianus is the half-brother of Caius Merlyn Britannicus ( Merlin ) and helps him lead the people of Camulod ( Camelot ).

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The sequence of events of the fifth and sixth centuries is particularly difficult to access, peppered with a mixture of mythology, such as the characters of Hengist and Horsa, and legend, such as St Germanus's so-called " Alleluia Victory " against the Heathens, and half-remembered history, such as the exploits of Ambrosius Aurelianus and King Arthur.

Geoffrey combined existing stories of Myrddin Wyllt ( Merlinus Caledonensis ), a North Brythonic prophet and madman with no connection to King Arthur, with tales of the Romano-British war leader Ambrosius Aurelianus to form the composite figure he called Merlin Ambrosius ().

Following the destructive assault of the Saxons, the survivors gather together under the leadership of Ambrosius, who is described as ;

The first is what Gildas meant by saying Ambrosius ' family " had worn the purple ".

The second question is the meaning of the word avita: Gildas could have meant " ancestors ", or intended it to mean more specifically " grandfather " — thus indicating Ambrosius lived about a generation before the Battle of Mons Badonicus.

The most significant of these is the story about Ambrosius, Vortigern, and the two dragons beneath Dinas Emrys, " Fortress of Ambrosius " in Chapters 40 – 42.

But there are smaller snippets of tradition preserved in the Historia Brittonum: in Chapter 31, we are told that Vortigern ruled in fear of Ambrosius ; later, in Chapter 66, various events are dated from a Battle of Guoloph ( often identified with Wallop, ESE of Amesbury near Salisbury ), which is said to have been between Ambrosius and Vitolinus ; lastly, in Chapter 48, it is said that Pascent, the son of Vortigern, was granted rule over the regions of Buellt and Gwrtheyrnion by Ambrosius.

Léon Fleuriot has suggested Ambrosius is identical to Riothamus, a Brythonic leader who fought a major battle against the Goths in France around the year 470.

When King Constantine's eldest son Constans is murdered at Vortigern's instigation, the two remaining sons, Ambrosius and Uther, still very young, are quickly hustled into exile in Brittany.

In the novel Ambrosius is a separate character from Arthur, or Artorius, who appears much later as a foe of Cerdic.

Aurelius Ambrosius, better known in English as Saint Ambrose ( c. 330 – 4 April 397 ), was an archbishop of Milan who became one of the most influential ecclesiastical figures of the 4th century.

Because Ambrosius and Vortigern are shown in the Historia Brittonum as being in conflict, some historians have suspected that this preserves a historical core of the existence of two parties in opposition to one another, one headed by Ambrosius and the other by Vortigern.

J. N. L. Myres built upon this suspicion and speculated that belief in Pelagianism reflected an actively provincial outlook in Britain and that Vortigern represented the Pelagian party, while Ambrosius led the Catholic one.

In Stargate SG-1, Ambrosius and Arthur are one and the same.

The city is the birthplace of one of Johann Sebastian Bach's cousins, Johann Bernhard Bach, as well as Johann Sebastian Bach's father Johann Ambrosius Bach.

His role could be embellished and added to that of Aurelianus Ambrosius, or he could be made into one of old Uther's favourite advisors and naught more.

This Idyll is told in flashback by Sir Percivale, who had become a monk and died one summer before the account, to his fellow monk Ambrosius.

Angry citizens captured the Donskoy Monastery, killed Archbishop Ambrosius, and destroyed two quarantine zones ( Danilov Monastery and the one beyond the Serpukhov Gates ).

* December 7 – The people of Milan astonish Ambrosius, governor of Aemilia-Liguria, by acclaiming him bishop.

Ampíes covenanted to respect the authority of the Native chief Manaure highest authority of the natives of the region, the Caquetio people, This covenant is broken abruptly in 1529 with the landing at the city's first Governor and Captain General Ambrosius Ehinger representing the Welser, a banking and trading family.

It also appears that Ambrosius was a Christian: Gildas says that he won his battles " with God's help ".

According to Gildas, Ambrosius organised the survivors into an armed force and achieved the first military victory over the Saxon invaders.

Bede follows Gildas ' account of Ambrosius in his Ecclesiastical History of the English People, but in his Chronica Majora he dates Ambrosius ' victory to the reign of the Emperor Zeno ( 474 – 491 ).

( This does not fit with Gildas ' account, in which Ambrosius ' family perished in the turmoil of the Saxon uprisings.

Some modern scholars suggest that Gildas ' text implies that Aurelius Ambrosius was the Briton leader at Badon.

Aurelius Ambrosius is Ambrosius Aurelianus, mentioned by Gildas, though his connection to Constantine and Constans is unrecorded.

It was clearly a historical battle, being described by Gildas, who does not mention the name of the Britons ' leader ( he does, however, mention Aurelius Ambrosius as a great scourge of the Saxons immediately prior.

Lloyd suggests a connection with the degenerate descendants of the great hero Aurelius Ambrosius whom Gildas mentions in Chapter 25.

Many historical personas ( some already included in the Arthurian legend ) exist in the Cycle, alongside less " factual " characters: Taliesin, Magnus Maximus, Theodosius, Ambrosius Aurelianus, Vortigern, Constantine III, Myrddin Wyllt, Clovis I, Gwyddno Garanhir, Elffin ap Gwyddno, Horsa, Hengest, Cerdic, Aelle, Gildas, and Aneirin ( in the series, it is revealed that the last two are the same person ; born with the name Aneirin, he changes it to Gildas after Arthur's death ).

According to Gildas, initial vigorous British resistance was led by a man called Ambrosius Aurelianus, from which time victory fluctuated between the two nations.