167) of the Treaty of Windsor.

He had pledged himself to marry the Princess Mary, and the splendour of that match may have contributed to Henry's desire for an alliance with Charles.

But another matrimonial project offered the Emperor more substantial advantages.

Ever since 1517 his Spanish subjects had been pressing him to marry the daughter of Emmanuel, King of Portugal.

The Portuguese royal family had claims to the throne of Castile which would be quieted by Charles's marriage with a Portuguese princess.