Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
He is, after the death of his father on 7 April 2015, first in line of succession to the defunct Bulgarian throne.
Boris, who has maintained close relations with the Spanish royal family since his father's death, speaks Spanish, English, French and some Bulgarian. He is an artist, devoted to sculpture, plays the guitar and was educated at the Lycée Français Molière in Villanueva de la Cañada in the vicinity of Madrid. He completed his International Baccalaureate studies at Sankt Gilgen International School near Salzburg, in Austria.
Titles
12 October 1997 – 7 April 2015: His Royal Highness Prince Boris of Bulgaria, Duke in Saxony
7 April 2015 – present: His Royal Highness The Prince of Tarnovo
^ de Badts de Cugnac, Chantal. Coutant de Saisseval, Guy. Le Petit Gotha. Nouvelle Imprimerie Laballery. Paris. 2002. pp. 328-329, 335-337, 340 (French) ISBN2-9507974-3-1