Title: Ivan the Terrible
Content:  Ivan was the first son of Vasili III and his second wife, Elena Glinskaya. Vasili's mother was a Greek princess and member of the Byzantine Palaiologos family. She was a daughter of Thomas Palaiologos, the younger brother of the last Byzantine Emperor, Constantine XI Palaiologos ((r. 1449 – 1453)). Elena's mother was a Serbian princess and her father's family, the Glinski clan (nobles based in the Grand Duchy of Lithuania), claimed descent both from Orthodox Hungarian nobles and the Mongol ruler Mamai (1335–1380.)  When Ivan was three years old, his father died from an abscess and inflammation on his leg that developed into blood poisoning. Ivan was proclaimed the Grand Prince of Moscow at the request of his father. His mother Elena Glinskaya 
Title: Ivan IV of Ryazan
Content:  Ivan IV of Ryazan was married to Princess Agrafena (Agrippina) Vasilyevna Babich-Drutskaya, daughter of Prince Vasily Ivanovich of Drutsk, on July 13, 1485, in Pereyaslavl of Ryazan. The wedding was conducted by the Bishop of Ryazan Simeon. His spouse was related to Polish King Casimir IV through her mother. In the marriage they had a son, Ivan, who succeeded the throne of Ryazan. The latest genealogies claim he had two more sons, Vasily and Fyodor, who are not acknowledged by the respected historians. Because of the shortcomings of the agreement of 1496, his brother, Prince Fyodor (d. 1503), bequeathed his appanage to Grand Duke of Moscow, Ivan III.
Title: Ivan IV of Ryazan
Content:  Grand Duke Ivan IV of Ryazan (Ivan Vasilyevich of Ryazan; Иван Васильевич, великий князь рязанский; April 14, 1467, Moscow – May 29, 1500) was the ruler of the Grand Duchy of Ryazan (1483–1500). He was the elder son of Grand Duke Vasily Ivanovich of Ryazan and Grand Duchess of Ryazan Anna Vasilyevna, younger sister of Ivan III of Moscow. He had a younger brother, Prince Fyodor Vasilyevich, with whom he shared domains in the Duchy of Ryazan.
Title: Ivan the Terrible
Content:  Ivan IV Vasilyevich (Ива́н Васильевич; 25 August 1530 – 28 March 1584), commonly known in English as Ivan the Terrible (from, romanized: Ivan Grozny, lit. "Ivan the Formidable" or "Ivan the Fearsome", Ioannes Severus, monastic name: Jonah ), was the grand prince of Moscow from 1533 to 1547 and the first Moscow ruler who declared himself tsar of all Russia from 1547 to 1584. Ivan was the first Moscow ruler born after its independence. The son of Vasili III, the Rurikid ruler of the Grand Duchy of Moscow, he was appointed grand prince when he was three years old after his father's death. A group of reformers known as the "Chosen Council" united around the young Ivan, declaring him 
Title: Ivan II of Moscow
Content: Dmitri Donskoi (12 October 1350 – 19 May 1389). His successor in the Grand Duchy of Moscow. ; A daughter married Prince Bobrok of Volhynia. ; Ivan Ivanovich, Prince of Zvenigorod (c. 1356 – October 1364). ; Maria Ivanovna. Ivan was married twice. In 1341, Ivan married his first wife Fedosia Dmitrievna of Bryansk. She was a daughter of Dmitry Romanovich, Prince of Bryansk. She died childless in autumn 1342. Ivan remained a widower for three years. In 1345, Ivan married his second wife, Alexandra Vassilievna Velyaminova. She was a daughter of Vasily Velyaminov, a mayor of Moscow. They had at least four children: 
Title: Ivan V of Russia
Content:  Ivan V was born in 1666 in Moscow, the youngest son of Tsar Alexi and Maria Miloslavskaya. Only two of his older brothers survived childhood; his eldest brother, Alexei, died aged 15 in 1670, therefore his second brother, Feodor, became tsar upon the death of their father. When Feodor died in 1682 without leaving an heir, Ivan, who was thought to be "infirm in body and mind", was passed over in favor of his younger half-brother, Peter. The church and the Naryshkins (family of Peter's mother, Natalya Naryshkina) supported Peter's ascension to the throne, however, the family of Ivan V's mother (the Miloslavski) and Ivan's older sister, Sofia Alekseyevna, 
Title: Ivan III of Ryazan
Content:  Ivan was the younger son of Fyodor II of Ryazan, but he became first in line to the throne after the death of his brother in 1407. His mother was Sofia, the daughter of Dmitry Donskoy. On the death of his father in 1427, Ivan became Grand Prince. He kept good relationships with his large and powerful neighbours. In 1429, he attended the Congress of Lutsk and made Ryazan a vassal of the Grand Duchy of Lithuania under Vytautas. He signed a peace treaty with Vasily II of Moscow in 1447 and married his son and heir to Vasily's daughter. Near to his death he sent his two children to the court in Moscow for safety. It was during Ivan's reign that coins from Ryazan started to include the name of the grand duke. With his wife Anna he had two sons, Peter and Vasily, and a daughter, Feodosiya. In 1456 he took the monastic vows under the name Iona and soon afterwards died. His eight-year-old son Vasily succeeded him but remained in the court of Vasily II, not returning to Ryazan until 1463.
Title: Tsarevich Ivan Ivanovich of Russia
Content:  Ivan Ivanovich is believed to have been killed by his father, Ivan the Terrible. Ivan Ivanovich's relationship with his father began to deteriorate during the later stages of the Livonian War. Angry with his father for his military failures, Ivan demanded to be given command of some troops to liberate besieged Pskov. Their relationship further deteriorated when on 15 November 1581, the Tsar, after seeing his pregnant daughter-in-law wearing unconventionally light clothing, physically assaulted her. Hearing her screams, the Tsarevich rushed to his wife's defense, angrily shouting, "You sent my first wife to a convent for no reason, you did the same with my second, and now you strike the third, causing the death 
Title: Ivan V of Russia
Content:  Ivan V Alekseyevich (Russian: Иван V Алексеевич, 6 September 1666 &ndash; 8 February 1696) was a joint Tsar of Russia with his younger half-brother Peter the Great, who co-reigned between 1682 and 1696. Ivan was the youngest son of Alexis I of Russia by his first wife, Maria Miloslavskaya, while Peter was the only son of Alexis by his second wife, Natalya Naryshkina. Ivan's reign was solely titular because he had serious physical and mental issues.
Title: Tsarevich Ivan Ivanovich of Russia
Content:  Ivan Ivanovich (Ива́н Иванович) (28 March 1554 &ndash; 19 November 1581) of the House of Rurik, was a Tsarevich (heir apparent) of Russia. He was the son of Ivan the Terrible, who killed him in a fit of rage.

Question: Who is the mother of Ivan IV Vasilyevich?
Answer: Elena Glinskaya.
Yelena Vasilyevna Glinskaya.