CLITHEROE, Lancashire (Fig. 13).--There is no express mention of this castle in Domesday Book, but of two places in Yorkshire, Barnoldswick and Calton, it is said that they are in the _castellate_ of Roger the Poitevin.[363] A castellate implies a castle, and as there is no other castle in the Craven district (to which the words of the Survey relate) except Skipton, which did not form part of Roger's property, there is no reason to doubt that this castle was Clitheroe, which for centuries was the centre of the Honour of that name. The whole land between the Ribble and the Mersey had been given by William I. to this Roger, the third son of his trusted supporter, Earl Roger of Shrewsbury. One can understand why William gave important frontier posts to the energetic and unscrupulous young men of the house of Montgomeri, one of whom was the adviser and architect of William Rufus, another a notable warrior in North Wales, another the conqueror of Pembrokeshire. As it appears from the Survey that Roger's possessions stretched far beyond the Ribble into Yorkshire and Cumberland, it seems quite possible--though here we are in the region of conjecture--that just as his father and brothers had a free hand to conquer as they listed from the North and South Welsh, so Roger had a similar commission for the hilly districts still unconquered in the north-west of England. But fortune did not favour the Montgomeri family for long. They were exiled from England in 1102 for siding with Robert Curthose, and in the same year we find the castle of Clitheroe in the hands of Robert de Lacy, lord of the great Yorkshire fief of Pontefract.[364]