In the middle ages the Fairfaxes ranked amongst the minor landed gentry of Yorkshire. They seem to have risen to this status in the thirteenth century, partly by buying land out of the profits of trade in York, partly by successful marriages. But they remained of little importance until the later fifteenth century. They had, by then, produced no more than a series of bailiffs of York, a treasurer of York Minster and one knight of the shire. The head of the family was not normally a knight. The family property consisted of the two manors of Walton and Acaster Malbis and house property in York. But in the later fifteenth century and onwards the fortunes of the family were in the ascendant and they began a process of quite conscious social climbing. At the same time they began to increase considerably in numbers. The three main branches, with al1 their cadet lines, were fixed by the middle of the sixteenth century – the senior branch, Fairfax of Walton and Gilling, the second branch, Fairfax of Denton, Nunappleton, Bilhorough and Newton Kyme, the third branch, Fairfax of Steeton. It is very important for any attempt to assess the strength and nature of Catholicism in Yorkshire to try to understand the strong family – almost clan – unity of these pushing, rising families. While adherence to Catholicism could be primarily a personal choice in the face of family ties and property interests, the history of the Faith in Yorkshire was conditioned greatly at every point by the strength of those ties and interests. The minute genealogy and economic history of the gentry has therefore a very direct bearing on recusant history.