Shishman dynasty
Vasilisa
The youngest daughter of tsar Ivan Alexander, sister of Desislava; both born of the second marriage to Sarah-Theodora. She died very young.
Biography
Vasilisa was the youngest daughter of Tsar Ivan Alexander from his marriage to Sara-Theodora and a sister of Desislava.
She is mentioned in the Synodikon of Tsar Boril, but is absent from the family portraits in the Tetraevangelion of 1355/56 — probably because she died very young, before or shortly after the manuscript was made.
Sources
“[Василиса] е най-малката дъщеря на българския цар … двете [с Десислава] са най-малките деца.”
— Genealogy and Prosopography of the Asen Dynasty 1186–1460, p. 235