Notes on the Diaries of Sir Justinian Isham, the fifth baronet of Lamport, would hardly be complete unless allusion were made to the origin of his house. He and his forefathers were ever careful to make a note of every family event, whether christening or burial, the building of a house, the planting of trees or the making of a pond. Sir Justinian added to the materials already to hand, and with the help of many friends among clergy and laity, including John Bridges, the Northamptonshire historian, he made collections from parish registers, wills, and other sources. From these he carefully put together the family pedigree, marking as certain that only for which he had ample evidence. His pedigree, representing the family tradition, has lately been proved to be correct in several steps; possibly the earlier portion may yet be confirmed. A manorial family of Isham dwelt at Isham from the twelfth to the fourteenth century. Isham is a village on the Isebrook. It has been suggested that in the fess wavy of the arms of the family there is an allusion to the brook, and that in the piles wavy we may see the icicles which play upon the name of the house.