His Highness Prince John Constantinovich

Sources of biographical information

Birth: Date and time: Medical bulletin. Published in Governmental Herald, 1886, # 136, June 24 (July 6), page 1.

Title: Ukase of Emperor Alexander III to Senate given in Peterhof on July 3 (15), 1886. Published in Governmental Herald, 1886, # 146, July 5 (17), page 2.

Christening: Highestly Approved Ceremonial of the Saint Baptizm of His Highness Prince John Constantinovich. Published in Governmental Herald, 1886, # 150, July 10 (22), page 1. and Domestic news, Governmental Herald, 1886, # 154, July 15 (27), page 2.