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John Erskine , 22nd and de jure 6th Earl of Mar , KT ( 1675 – May 1732 ) , Scottish Jacobite , was the eldest son of the 21st Earl of Mar ( who died in 1689 ) , from whom he inherited estates that were heavily loaded with debt .
 22nd, Earl, Mar, Scottish, 21st Earl of Mar
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Answer:
 22nd, Earl, Mar, Scottish, 21st Earl of Mar