The invasion was first stopped by the Romano-British. Indeed Subroman Britain initially successfully fought the invasion of the anglosaxons from northern Germany and the Jutland peninsula, thanks to a mytical king named King Arthur. Probably Ambrosius Aurelianus, who was a powerful Romano-British leader in Subroman Britain around mid-5th century, was King Arthur. He was renowned for his campaigns against the Saxons, and there is some speculation that he (or his son, according to the historian Gildas) may have commanded the Romano-british forces at the Battle of Badon Hill, where the barbarians were won around 500 AD.