Which preposition to use with registrars

of Occurrences 20%

Among the many respectable families in Lichfield, into whose society Johnson had been admitted, none afforded so great encouragement to his literary talents as that of Mr. Walmsley, who lived in the Bishop's palace, and was registrar of the Ecclesiastical Court, and whom he has so eloquently commemorated in his Lives of the Poets.

to Occurrences 4%

Though Selwyn did little with his two votes, he made them pay; and in addition to the post in the Mint, got out of the party he supported those of Registrar to the Court of Chancery in the Island of Barbadoes, a sinecure done by deputy, Surveyor of the Crown Lands, and Paymaster to the Board of Works.

at Occurrences 2%

There were a dozen men about her, and one of these I saw with delight was Dr. Price, our registrar at the college, a benign old man, who could deny me nothing.

Which preposition to use with  registrars