When the Nevilles were lords of the manor of Bywell, they began to build a castle here, which, however, was left unfinished; the ancient tower still standing, with its picturesque draping of ivy, was the gate-house of the intended fortress. On the rebellion of the northern earls in 1569, Westmoreland's forfeited lands passed to the crown, so that Bywell was held by Queen Elizabeth for a year or two, until she sold the estate to a branch of the Fenwick family.
Bywell is unique in Northumberland in possessing two churches side by side yet in different parishes. The town of Bywell, we are told by the same authority before quoted, lay in a long line by the north bank of the Tyne, and was "divided into two separate parishes" even then, so that there ought to be traces of former buildings westward from the present village. In connection with the two churches which adjoin each other so closely, tradition tells the well-known story of the two quarrelsome sisters who could not agree on the building of a church and therefore each built one. One might have imagined, with some show of reason, that there being two parishes, the two churches were placed there in sheltering proximity to the castle, were it not for the fact that the churches were in existence long before the stronghold of the Nevilles was contemplated.
St. Andrew's, called the "White" church from the fact of its being served in later days by the White friars, is the more ancient of the two. As we have seen, a church erected by St. Wilfrid stood on this site, and a goodly portion of the Saxon work remains in the tower. The hagioscope, or "squint" in this church, and the "leper" window in St. Peter's are interesting relics of the Middle Ages.
St. Peter's, or the "Black" church which once belonged to the Benedictines or Black friars, is of much later date than its neighbour, though still an ancient building, being supposed to date from the eleventh century. Its most interesting possessions are two very old bells, bearing Latin inscriptions, one announcing "I proclaim the hour for people rising, and call to those still lying down," and the other reading "Thou art Peter."
Bywell suffered greatly in the flood of 1771, when the bridge was swept away, many houses destroyed, several people drowned, and both churches greatly damaged.