Twenty years after the conquest by William the Conqueror, which Danish king planned a campaign to claim the crown of England?

King Cnut IV of Denmark planned an invasion of England in 1085 to reclaim the English crown. As the grandnephew of Cnut the Great, he considered William the Conqueror a usurper.

In 1085 he reasserted the Danish claims to England and, with the count of Flanders and King Olaf III of Norway, prepared a massive invasion fleet... Canute's plan, however, had to be abandoned suddenly, for those aristocrats who opposed his tax policy revolted.

https://www.britannica.com/biography/Canute-IV
https://en.wikipedia.org/wiki/Danish_attacks_on_Norman_England#Invasion_plans_of_1085%E2%80%931086

Twenty years after the Norman conquest of 1066, the Danish king who planned a massive campaign to claim the English crown was Canute IV (also known as Saint Canute). He gathered a massive fleet in 1085 to press his family's claim to the throne. However, the invasion never sailed as Canute was delayed by internal rebellions in Denmark, allowing William the Conqueror to prepare his defenses.