Another Question OF Britian: History of the Royals

I am aware there are parentage questions of at least two kings:

Edward III: was his father Edward II or William Wallace? (source: movie Braveheart)

James I: did the real James I die as an infant? (source: biography of Mary, Queen of Scotts)

Are there any other similar questionable parantage situations with the king or queen?

Please note I am not talking about events like the War of the Roses where two or more branches of the family claimed the throne.

shalimar