Alexander de Bicknor (1260s? – 14 July 1349; usually spelled "Bykenore" in original Middle English sources) was an official in the Plantagenet kingdom under Edward I of England, Edward II of England, and Edward III of England. Best known to history as the Archbishop of Dublin from 1317 until his death in 1349, his career involved extensive diplomatic missions for the King and the holding of numerous civil and ecclesiastical offices in Ireland, including Lord Treasurer of Ireland (1307–1309) and Lord Chancellor of Ireland.
De Bicknor's date of birth is unclear. Numerous mentions of an Alexander de Bicknor can be found in Gloucestershire records in the late 13th century and in the first decade of the 14th century. Both Gallagher and Phillips consider these to be the same man as the later archbishop, surmising a birthdate in the 1260s. The earliest mention appears to be as bailiff of Gloucester in 1273, which puts this conclusion in some doubt, though there is a fairly continuous trail of records connecting this Alexander with the man who would become Archbishop of Dublin. Whether this is a case of unusual longevity for the period (he would have had to have been over 80 years old at his death) or two presumably related individuals of the same name is unclear, though there can be little doubt that de Bicknor was already a mature adult when elected archbishop in 1310. The career of this or these Alexander de Bicknors in Gloucestershire involved the wool trade at least one point as well as extensive activity in civil offices, including tax collection, service on commissions of oyer and terminer, and service as one of the two bailiffs of Gloucester for eight different years. De Bicknor was also among nine men of Gloucester charged with evasion of taxes on the wine trade in 1287, which would suggest a breadth of commercial interests. Given their presence in Gloucester, the de Bicknor family may have derived their toponymic surname from English Bicknor in Gloucestershire (the "English" qualifier did not generally appear until later). The Catholic Encyclopedia however associates him with another town named Bicknor in Kent, but in one instance in 1297 he is explicitly called "Alexander de Bykenore of Gloucester." Confusing the issue, there were indeed contemporary persons surnamed de Bicknor who were clearly associated with Kent (such as the knight and chief falconer of Edward I, John de Bicknor), so the issue remains in some doubt. According to the Patent Rolls, a licence to crenellate a structure in Ruardean, around four miles from English Bicknor, Glos., was granted to Alexander de Bicknor (almost certainly the archbishop in this case) by the King in 1311, which corroborates the identification with the de Bicknors of Gloucestershire and also indicates that he must have possessed a fairly substantial dwelling there. Fragments of this structure, now often referred to as "Ruardean Castle" can still be seen today.