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.

Ambrosius Aurelianus is one of the few people that Gildas identifies by name in his sermon De Excidio et Conquestu Britanniae, and the only one named from the 5th century.

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 ().

The fifth-century king Aurelius Ambrosius wished to erect a memorial to 3, 000 nobles slain in battle against the Saxons and buried at Salisbury, and at Merlin's advice chose Stonehenge.

According to Nennius, Ambrosius was discovered when the British king Vortigern was trying to erect a tower.

In many places in his Historia Regum Britanniae Geoffrey mixes British legend and his own imagination ; it is intriguing that he connects Ambrosius Aurelianus with this prehistoric monument as there is place-name evidence to connect Ambrosius with nearby Amesbury.

It has been suggested that the name of Amesbury is derived from Ambrosius Aurelianus, leader of Romano British resistance to Saxon invasions in the 5th century.

Born to a Greek father and a Black British mother, original Floetry members Marsha Ambrosius and Natalie Stewart met through their love of basketball and formed a friendship.

Floetry were a British R & B duo comprising Marsha Ambrosius (" the Songstress ") and Natalie Stewart (" the Floacist ").

In the 19th century it was believed that the toponym " Ambrosden " came from a diminutive derivative of the name Ambrosius Aurelianus, a 5th-century British commander of Roman descent, and that the commander had encamped close the present site of Ambrosden to help the neighbouring military garrison at Alchester in conflicts with the Anglo-Saxons.

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

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.

Geoffrey's composite Merlin is based primarily on Myrddin Wyllt, also called Merlinus Caledonensis, and Aurelius Ambrosius, a mostly fictionalised version of the historical war leader Ambrosius Aurelianus.

* Ambrosius Aurelianus, war leader of the Romano-British, is proclaimed king of the Britons ( according to Historia Regum Britanniae ).

* Ambrosius Aurelianus, leader of the Romano-British, defeats the Anglo Saxons under king Vortigern in the Battle of Wallop.

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

He excoriates his fellow Britons for their sins, while at the same time lauding heroes such as Aurelius Ambrosius, whom he is the first to describe as a leader of the resistance to the Saxons.

There are many theories, but it is sometimes said that Ambrosius Aurelianus, the leader of the Romano-British forces, was the model for the former, and that Arthur's court of Camelot is an idealised Welsh and Cornish memory of pre-Saxon Romano-British civilisation.

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.

Geoffrey of Monmouth wrote about the town, claiming that it had been fortified by Ambrosius Aurelianus, king of the Britons after his victory over the Saxon forces of Hengist ( Historia Regum Britanniae viii, 7 ), that the captive Saxon leader Hengist was hacked to pieces by Eldol outside the town walls, and was buried at " Hengist's Mound " in the town.

* Lothar Ambrosius ( 1903 – 1971 ), German military leader of the Wehrmacht during World War II

* Ambrosius ( Hussite ), priest, leader of Hussite peasants

Their civil leader was the priest Ambrosius, and their hetman was Hynek Krušina from Lichtenburk.

Ambrosius Aurelianus ( also sometimes referred to as Aurelius Ambrosius ) was a powerful Romano-British leader in Britain.

In this version, Merlin's father is Aurelius Ambrosius, the Roman war leader, Uther Pendragon's brother, making Merlin Arthur's cousin.