1. RP 6866/1 Reference (shelfmark): RP 6866/1 Title: Scope & Content: PETER THE GREAT, of Russia. Letter Signed to [Frederick I of Prussia], a gracious and formal letter of congratulation Creation dates: 18 Oct 1710 Collection Area: Western Manuscripts Languages: Undetermined Date Range: 29 Jul 1998 Extent: 1 photocopy