Which preposition to use with posthumus

by Occurrences 1%

One of these gentlemen, whose name was Iachimo, being offended that a lady of Britain should be so praised above the Roman ladies, his countrywomen, provoked Posthumus by seeming to doubt the constancy of his so highly-praised wife; and at length, after much altercation, Posthumus consented to a proposal of Iachimo's, that he (Iachimo) should go to Britain, and endeavour to gain the love of the married Imogen.

in Occurrences 1%

Such firm faith had Posthumus in the fidelity of Imogen, that he thought he ran no hazard in this trial of her honour.

Which preposition to use with  posthumus