In 1811 Letters Patent were filed in Vilnius and in St Petersburg for Grand Duke/Prince Gedroyc  when Lithuania (including Belarus Ukraine) was still a Grand Duchy within Russia.

First page of LP 1811 Vilnius 
LP 1811 Vilnius page 1
Final page (12) of LP 1811 Vilnius
LP 1811 Vilnius final page 12
Thumbnails of pages 2-11 of LP 1811 Vilnius