Historian James A. Williamson in his work of 1913 thought this fact aided an argument against Richard Eden's statement that Spert's misconduct had spoiled the success of the 1516-1517 voyage of discovery undertaken with Sebastian Cabot.
Williamson said that the ballasting office apparently provided opportunity for profit, and would not have been granted to a man who had recently disgraced himself.
[2] A document in the Public Record Office is found in a manuscript book showing the issues of various stores to the masters of the king's ships.
Together with the grant made to him on 10 July 1517, Williamson argued that these appear to be conclusive evidence that Spert was not traveling with Sebastian Cabot in a voyage of discovery in 1516–1517 to the southern coast of North America.
[5] His knighthood has been disputed by historians, but Williamson notes two official documents that refer to him as Sir Thomas Spert (Letters and Papers, vi, No.
[6] Spert made his will 28 November 1541, naming his wife Mary (Fabian) as executrix, and died at Stepney in December.
He also made bequests to his daughter and to his cousin Margaret Spert, who was married to 'the famous Guinea seaman, John Lok'.