Title: Константиновские чтения - 2019
Subjects: Congresses, History, Konstantinovskiĭ dvoret͡s (Saint Petersburg, Russia)
Places: Strelʹna (Saint Petersburg, Russia)
People: Konstantin Nikolaevich Grand Duke of Russia (1827-1892), Igorʹ Konstantinovich Prince, son of K. R. (Konstantin Romanov), Grand Duke of Russia (1894-1918), Dmitriĭ Konstantinovich Grand Duke of Russia (1860-1919), House of Romanov