Портрет к статье «Константин Николаевич, Великий Князь» № 1. Военная энциклопедия Сытина (Санкт-Петербург, 1911-1915), Petr Borel, before 1914

Grand duke konstantin nikolayevich of russia (21 september 1827 – 25 january 1892) was the second son of tsar nicholas i of russia and younger brother of tsar alexander ii. Date: before 1914.