High Kings of the Anglo Saxon Period
Puzzle 19 of Building a House Hard Pack
Question is: High Kings of the Anglo Saxon Period
and the answer is: BRETWALDA
Word Meaning:
BRETWALDA — (historical) A title given to some of the rulers of Anglo-Saxon kingdoms from the 5th century onwards who had achieved overlordship of some or all of the other Anglo-Saxon kingdoms.
Definitions from Wiktionary.