From this letter we learn definitely (1) that Giorgione died in October-November 1510; (2) that he died of the plague.
I have pointed out in the text that the above description of the two pictures "de una notte" corresponds with the actual Beaumont and Vienna "Nativities," or "Adoration of the Shepherds," in which I recognise the hand of Giorgione.
The following is the only existing document in Giorgione's own handwriting. It was published by Molmenti in the Bollettino delle Arti, anno ii. No. 2, and reprinted by Conti, p. 50:—
"El se dichiara per el presente come el clarissimo Messer Aluixe di Sesti die a fare a mi Zorzon de Castelfrancho quatro quadri in quadrato con le geste di Daniele in bona pictura su telle, et li telleri sarano soministrati per dito m. Aluixe, il quale doveva stabilir la spexa di detti quadri quando serano compidi et di sua satisfatione entro il presente anno 1508.
"Io Zorzon de Castelfrancho di mia man scrissi la presente in Venetia li 13 febrar 1508."
Whether or no Giorgione ever completed these four square canvases with the story of Daniel is unknown. There is no trace of any such pictures in modern times.