On 24/08/17 15:22, Paulo Canedo wrote: > Em quinta-feira, 24 de agosto de 2017 14:17:37 UTC+1, Douglas Richardson escreveu: >> As per his inquisition post mortem, Sir Hugh de Swynford died as stated 23 November 1371. John Beaufort, however, is said to have been aged 21 in 1392. If John Beaufort's age in 1392 is anything close to correct, a simple math calculation tells us the obvious truth that Katherine de Roet must have had her affair with John of Gaunt during her husband's lifetime. This explains the comment that John Beaufort was "gotten" in double adultery. Double adultery indeed. > > Do you mean 13 or 23? Assuming the translation in CIPM vol 13, no 204 is correct, he died 13 Nov 1371. The IPM was taken on the Tuesday after the Feast of St Mark the Evangelist, 46 Edward III. The Feast of St Mark is 25 Apr, and in 46 Ed III (1372) it was a Sunday, so the IPM was on 27 Apr 1372. He is said to have died on the Thursday after the Feast of St Martin in the previous winter. The Feast of St Martin is 11 Nov which in 1371 was a Tuesday. He therefore died on 13 Nov 1371, per his IPM as translated. This date is given correctly in Richardson's /Royal Ancestry/ vol 3, p 492, sub Lancaster 11. Richard