Why was the king vortigern worried about the Scot and the picts?

King Vortigern was worried about the Scots and the Picts due to their frequent raids and invasions of his territory in Britain. These tribes posed a significant threat to his rule and the stability of his kingdom. Vortigern sought to secure his position by forging alliances and seeking military support to fend off these aggressors, which ultimately led to his decision to invite the Anglo-Saxons for assistance. This move, however, would have long-lasting consequences for Britain.