For the record, my edition of LotR has Sigismond's death in 1391, whereas this article put it in 1381. It is either a typo on the part of the previous editor(s), or one of the changes in the dates and the Family Trees in the newer editions of LotR. Perhaps Sigismond was considered to be too old in his 101 so his death age has been rationalized.
However the article Third Age 2991 supported the date mentioned in my edition.
Someone who owns the newer versions should please check if the date has indeed changed, and add a notification about the date change in the article. Sage 08:28, 1 November 2013 (UTC)