Build a movie plot around this: What tribe does Guern attribute his survival to? Selgovae
A:
In the year AD 140, twenty years after the Ninth Legion disappeared in the north of Britain, Marcus Flavius Aquila, a young Roman centurion, arrives in Roman Britain to serve at his first post as a garrison commander. Marcus's father disappeared with the eagle standard of the ill-fated legion, and Marcus hopes to redeem his family's honour by bravely serving in Britain. Shortly afterwards, only Marcus's alertness and decisiveness save the garrison from being overrun by Celtic tribesmen. He is decorated for his bravery but honourably discharged due to a severe leg injury.Living at his uncle's estate near Calleva (modern Silchester) in southern Britain, Marcus has to cope with his military career having been cut short and his father's name still being held in disrepute. Hearing rumours that the eagle standard has been seen in the north of Britain, Aquila decides to recover it. Despite the warnings of his uncle and his fellow Romans, who believe that no Roman can survive north of Hadrian's Wall, he travels north into the territory of the Picts, accompanied only by his slave, Esca. The son of a deceased chieftain of the Brigantes, Esca detests Rome and what it stands for, but considers himself bound to Marcus, who saved his life during an amphitheatre show.After several weeks of travelling through the northern wilderness, Esca and Marcus encounter Guern, a Roman born Lucius Caius Metellus, one of the survivors of the Ninth Legion, who attributes his survival to the hospitality of the Selgovae tribe. Guern recalls that all but a small number of deserters were killed in an ambush by the northern tribes including Esca's Brigantes and that the eagle standard was taken away by the Seal People, the most vicious of the tribes. The two travel further north until they are found by the Seal People. Identifying himself as a chieftain's son fleeing Roman rule and claiming Marcus as his slave, Esca is welcomed by the tribe. After allowing the Seal People to mistreat Marcus, Esca eventually reveals that his actions...