St. Ambrose answering the self-posed query, whether anyone having an image of a tyrant was liable to punishment, asserts that he remembered to have read that certain persons who wore rings bearing the effigies of Brutus and Cassius, the assassins of Cæsar, had been condemned to capital punishment.[216] Of course, the wearing of such a ring would imply not only an admiration of the person figured, but also devotion to his cause. The imprint of a proprietor’s seal was frequently made upon his trees, and served to establish his ownership, so that strangers could have no excuse for cutting them down, or in case of fruit trees, for plucking the fruit. The degree of confidence reposed in the seal impression is strikingly illustrated by the account that when Pompey learned that some of his soldiers were committing atrocities on the march, he ordered that all their swords should be sealed, and no one should remove the impression without having obtained permission to do so.[217] The symbols used as mint-marks on ancient coins are often reproductions of the seals of the chief magistrate of the city or district, or else of the mint-master. Among these may be noted such types as: a locust, a calf’s head, a dancing Satyr, a young male head, a culex (gnat), etc.[218] A ring as a mint-mark on early English coins is a clear indication that such coins were struck in one of the ecclesiastical mints. On a penny of Stephen’s reign (1135–1154), from the Archbishop of York’s mint, this mint-mark has been made by converting the left leaf of the fleur-de-lys surmounting the sceptre into a small annulet. The ring-mark appears on the coins of York from the earliest times, and is assumed to have been especially favored for the English Primate’s mint in reference to the Ring of St. Peter, or the Fisherman’s Ring. A penny, probably coined after the installation of Archbishop William in 1141, appears to be one of the earliest of this type. The reverse gives Ulf as the name of the coiner or moneyer.[219]