[1] The outbreak of the Western Schism meant that when Adam de Lanark, Bishop of Galloway, died in 1378, the two popes, Urban VI and Clement VII, supported alternative successors to the see.
[2] Oswald, whose earlier details are badly documented, at this point was claustral prior (deputy-abbot) of Glenluce Abbey and was elected locally to fill the vacant diocese.
[4] He was supported by Urban, but with the Kingdom of Scotland allied to Clement, Oswald had difficulties retaining possession of his see.
[7] Oswald spent the remainder of his days in England, acting as a suffragan of the Archbishop of York, carrying out various duties on his behalf; he is found as a suffragan of Cardinal Thomas Langley, Bishop of Durham, in 1406 and in 1416.
[9] While his death is unrecorded, he died sometime in 1417 or after, as the last notice of his existence occurs between September and December 1417.