Her name is mentioned in the Boril obituary in the following manner: ...To Kira Maria, the pious empress to the great emperor Ivan Shishman, eternal memory.
To mistress Desislava, mother of the pious empress Maria - to the great emperor Ivan Shishman, called in angel's form Debora, eternal memory...[1]The interpretation of the cited extract is not certain.
It is known that Ivan Shishman had a second wife - Dragana, daughter of Prince Lazar of Serbia and Milica.
Prince Lazar did not have a wife called Desislava and therefore it is possible that the name of the emperor's first wife was only Maria, while Dragana could have been called Kira Maria, unless there was a mistake in the paragraph and the places of the two empresses were changed.
[1] It has been suggested that Kira Maria descended by an important noble family from the capital Tarnovo.