The most complete account of this engagement is in John Lazaropoulos' Synopsis, although his text offers many difficulties. As Jan Olof Rosenqvist points out, Lazaropoulos drew on at least two different sources, which results in certain difficulties of interpretation, as well as raising the possibility that certain incidents are described twice. Moreover, Lazaropoulos has been shown to have introduced new details elsewhere that may be his own invention; the purpose of his account is not to offer an objective history, but to glorify Trebizond's patron saint, Eugenios.[13]