Evfrosinia Staritskaia
Evfrosinia Staritskaia née Khovanskaia (died 1569), was a Russian noblewoman.
In 1533, she married Prince Andrey of Staritsa, cousin of Tsar Ivan the Terrible.
She was described as ambitious and forceful.
She wished for the Staritski family to influence the regency of Ivan IV, and orchestrated a plot to depose the regent Elena Glinskaya.
She failed, and was imprisoned with her son Vladimir of Staritsa and her spouse, who died in prison.
After the death of regent Elena, Evfrosinia returned to court with her son and successfully influenced the Tsar to return the confiscated lands of her spouse.
In 1550, she arranged for her son to marry Evdokia Nagaja, and allied with the Belskii court faction in order to place her son Vladimir on the throne.
She created alliances with boyar families by including them in her household in her principality of Staritsa, and equipped the principality with her own army.
During the illness of Ivan IV in 1553, she actively pressed the claims of her son to the throne.
However, her plot failed as she did not managed to secure support in the Boyar Duma, nor the full cooperation of her son.
In response, she herself kept the seal and control of the family principality and refused to give it to her son even as he was no longer a minor.
When recovered, Ivan IV himself had Vladimir include a promise in his oath not to protect his mother if she was to "plan harm" against him again.
During the Livonian War, Vladmir was honored for his conduct in Battle and won popularity, which made the tsar fear that Evfrosinia would use her son's popularity against him.
In 1563, Evfrosinia was arrested and put on trial for alleged conspiracy and sentenced to live in a convent.
She was however allowed to keep her own household in the convent, allowed to make pilgrimage journeys and kept informed of political affairs, and thus the verdict had limited actual effect on her activity.
In 1569, Ivan IV again suspected Vladimir to be the object of plots to place him on the throne, orchestrated by his mother: he gave orders that she be executed, which was performed.
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Andrey of Staritsa
Andrey Ivanovich (August 5, 1490 – December 11, 1537) was the youngest son of Ivan III of Russia the Great by Sophia Palaiologina of Byzantium.
Since 1519, his appanages included Volokolamsk and Staritsa.
When his elder brother Vasily III ascended the throne, Andrey was just 14.
Like his other brothers, he was forbidden to marry until Vasily could produce an heir.
This didn't come to pass until 1530, but it was only two years later, when Vasily's second son was born, that Andrey was finally allowed to find himself a wife.
Several months later, on February 2, 1533, he married a Gedyminid Princess, Euphrosinia Andreyevna Khovanskaya.
Their only child, Vladimir, was born later that year.
Next month, however, Vasily died.
After 40 days of mourning, Andrey applied to his widow Elena Glinskaya for extension of his demesnes.
Elena denied him that favour and Andrey departed for Staritsa in anger.
There he heard that his only living brother, Yury Ivanovich, had been taken to prison and died there.
It is only natural that he declined Elena's emphatic invitations to visit Moscow and lived in Staritsa in seclusion for three following years.
He built there a fine cathedral, which still stands.
In 1537, however, it was rumoured that Andrey was going to escape to the Grand Duchy of Lithuania.
Upon hearing the news, Elena closed the Lithuanian border and dispatched her minion, Prince Obolensky, to seize him.
Andrey escaped to Novgorod, where he persuaded local nobility to join his cause.
Reluctant to appeal to arms, however, he surrendered to the mercy of Obolensky.
At Moscow, he was tried and thrown into prison with all his family.
He died several months later and was succeeded in Staritsa by his son Vladimir.
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Question: Who is Evfrosinia Staritskaia's mother-in-law?
Answer: Sophia Palaiologina