  stjepan (stephen) tvrtko i (1338 â 10 march 1391) was the ban of bosnia during 1353â77, king of bosnia and serbia during 1377â91, and king of croatia and dalmatia after 1390. a member of the bosnian kotromaniÄ dynasty which had ruled the banate of bosnia, he was a "politically adept and religiously tolerant ruler" and under his command bosnia reached its peak and became the strongest power in the balkans, conquering parts of what is today serbia, croatia and montenegro. ==family connections== tvrtko was the firstborn child of vladislaus of bosnia and jelena Å ubiÄ, who were married at the Å ubiÄ's klis fortress in croatia during summer-long festivities open to the whole population. tvrtko's father was the son of stephen i, ban of bosnia, and elizabeth of serbia. tvrtko's mother, countess jelena Å ubiÄ was the daughter of count george ii Å ubiÄ from the noble Å ubiÄ family. tvrtko was the first cousin of elizabeth of bosnia, the daughter of vladislaus's brother, ban stephen ii kotromaniÄ. in the times when the plague was devastating the region, tvrtko's mother jelena Å ubiÄ was in charge of the household, which, among others, included her own family, including her ailing husband vladislaus, and the family of her ailing in-laws of stephen ii kotromaniÄ. jelena brought up her own children, tvrtko, his younger brother stephen vuk, and his sister catherine, together with her niece and adopted daughter elizabeth. ==ruler== ===ban=== thumb|150px|left| king tvrtko i's gold coin (14th century) averse - with lion rampant (moneta aurea regis stephani). [[file:tvrtkoirevers.png|thumb|150px|left| king tvrtko i's gold coin (14th cen
1338_births 1391_deaths Bans_of_Bosnia Bogomilism Bosnia_and_Herzegovina_Roman_Catholics Bosnian_monarchs House_of_KotromaniA Pretenders_to_the_Serbian_throne_in_the_Middle_Ages Roman_Catholic_monarchs