Agreement deed between Nuno Dias de Castro, mercador, executor of Diogo Mendes Guterres' will, and the brotherhood of Santíssimo Sacramento of the church of S. Nicolau of Lisboa, by which its members donate a chapel in that church to the former, which would contain the remains of Diogo Mendes Guterres and his descendants. In exchange for that, the executor gives 180 000 réis to them, which would pay for the reconstruction of the main chapel. This donation is made under the condition that the future administrators of the chapel should allow it to be used by the brotherhoods of S. Paulo and the menino perdido, preserving the statue of that saint and promising not to put railings around it. Contains copies of an extract of the institutor's will and an extract of his codicil. Followed by a letter of possession issued on 1645-10-13.