Nicholas I of Montenegro (d. 1921)
Nikola I Petrović-Njegoš (Serbian Cyrillic: Никола I Петровић-Његош; 7 October [O.S. 25 September] 1841 – 1 March 1921) was the ruler of Montenegro from 1860 to 1918, reigning as prince from 1860 to 1910 and as the country's first and only king from 1910 to 1918.