Caithness was the son of Alexander Sinclair, 13th Earl of Caithness, and his wife Frances Harriet, daughter of the Very Reverend William Leigh, Dean of Hereford.
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His nomination by Lord John Russell to the vacant see of Hereford in December 1847 was again the signal for organized opposition; and his consecration in March 1848 took place in spite of a remonstrance by many of the bishops, and the resistance of John Merewether, the dean of Hereford, who voted against the election.