Date: 1705
From: Rabbi Tzvi Ashkenazi
To: Kahal Kadosh Sha'ar Hashamayim
Letter from the Chacham Tzvi defending Chacham David Nieto, after the latter was accused of having pantheistic leanings when he gave a controversial drasha about God and Nature[note]
Source: Shu"t Chacham Tzvi §18