 One of the main ethnographic results of Jacobi at the time was discovering people of clearly Finno-Ugric descent, whom he attributed to be descendants of historical Vyatichs tribe.Pavel Jacobi died in Saint Petersburg in 1913.His son, Ivan Palvovich Jacobiy was a notable political thinker of White Emigre, the author of the book "Nicholas II and the Revolution" (Tallinn, 1937).