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All answers having "Kings" as clue:

3 Character Answers:

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ROW



4 Character Answers:

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BEDS

REIS



5 Character Answers:

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SIRES

THREE

TSARS



6 Character Answers:

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NOBLES

PIECES

RANSOM

RULERS



7 Character Answers:

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ROYALTY

SPORTOF



8 Character Answers:

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MONARCHS



10 Character Answers:

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SOVEREIGNS



15 Character Answers:

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ALANANDRICHARDI

LEARKONGANDCOLE



19 Character Answers:

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CONSTANTINEANDOLAVV



23 Character Answers:

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GUSTAVBAUDOUINANDHASSAN