The Henry III of Castile reference article from the English Wikipedia on 24-Jul-2004
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Henry III of Castile

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Henry III (1379 - 1406) was the son of John I of Castile and succeeded him as King of Castile and León in 1390.

King Henry began the conquest of the Canary Islands in 1402.

He married:

Preceded by:
John I
King of Castile Succeeded by:
John II
King of Leon