Who was the first claimant to the throne to invade in1066?

The first claimant to the English throne to invade in 1066 was Harold Hardrada, the King of Norway. He landed in Northumbria in September of that year, asserting his claim based on a supposed agreement between earlier kings. His invasion culminated in the Battle of Stamford Bridge on September 25, where he was defeated by King Harold II of England. This battle marked a significant moment in the lead-up to the Norman Conquest.