Facts:   - title: byzantine empress consort    - mother: sarah-theodora    - predecessor: helena kantakouzene      - house: house of shishman house of palaiologus    - birth date: 1348    - issue: john vii palaiologos    - consort: yes    - caption: manuscript alexander '' -rrb- . miniature of keratsa -lrb- '' tetraevangelia of ivan    - succession: byzantine empress consort    - reign: 12 august 1376 & ndash ; 1 july 1379    - spouse: andronikos iv palaiologos    - death date: 1390    - father: ivan alexander    - name: keratsa-maria    - death place: byzantine empire    - birth place: bulgaria    - successor: helena kantakouzene    - image size: 100px    - image: keratsa of bulgaria.jpg   Based on these bullet points, write a short biography describing the life of keratsa of bulgaria .
The answer to this question is:
keratsa-maria of bulgaria -lrb- -rrb- -lrb- 1348 -- 1390 -rrb- was princess of bulgaria during the second bulgarian empire and empress of byzantine empire .she was the daughter of tsar ivan alexander of bulgaria and his second wife , a converted jewess , theodora .