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English word knightdom comes from English knight, English -dom
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knight (English)
(chess, transitive) To promote (a pawn) to a knight.. (transitive) To confer knighthood upon. (card games, dated) A playing card bearing the figure of a knight; the knave or jack.. (chess) A chess piece, often in the shape of a horse's head, that is moved two squares in one direction and one at right angles to that direction in a single move, leaping over any intervening pieces.. A warrior, [...]
-dom (English)
Forming nouns denoting the condition or state of the suffixed word.. Forming nouns denoting the domain or jurisdiction of the suffixed word.. Forming nouns denoting the fandom of the suffixed word.. Forming nouns — usually nonce words — denoting the set of all examples of the suffixed word.
knightdom (English)
(countable) The domain of a knight. (uncountable) The quality, or condition of a knight; knighthood. (uncountable) The sphere or world of knights; knights collectively.