The simple answer is that no-one really knows. Matthew was a common Jewish name and there were no such things as surnames or standard birth certificates. What we can be certain of is that Matt the author was writing for his fellow Jews; people who deeply and often passionately believed in and worshipped the God of the Old Testament.
So Matthew is the one who explains how Jesus fits in to Gods plan and prophetic predictions from way back.
the sound of bitter weeping.
Rachel is crying for her children;
she refuses to be comforted,
for they are dead.
Alexander sought out one of his "sponsors" who was sympathetic and thus helped acquire the land from William de Poitou. The monks moved in, displacing the hermits, some of whom joined the abbey, the rest being paid to move. The buildings were mostly completed between 1152 when the monks arrived in Kirkstall and the end of Alexander's abbacy in 1182.