Spending years in the same restrictive quarters with her sister, Zoe had come to loathe Theodora. Zoe convinced Romanos to appoint one of his own men as the chief of Theodora's household, with orders to spy on her. Shortly afterwards, Theodora was accused of plotting to usurp the throne, first with
Presian in 1030, followed by Constantine Diogenes, the governor of
Sirmium, in 1031. Zoe accused her of being part of the conspiracy, and Theodora was forcibly confined in the
monastery of Petrion. Zoe later visited her sister and forced her to take religious vows. Zoe was obsessed with continuing the Macedonian dynasty. Almost immediately upon marrying Romanos the fifty-year-old Zoe tried desperately to become pregnant. She used magic charms, amulets, and potions, all without effect. This failure to conceive helped alienate the couple, and soon Romanos refused to share the marriage bed with her. Romanos limited his wife's spending and paid her little attention. Zoe, furious and frustrated, engaged in a number of affairs. Romanos tolerated these and took a mistress himself. In 1033 Zoe became enamoured of a low-born servant called
Michael. She flaunted her lover openly and spoke about making him emperor. Rumours of her conduct led Romanos to confront Michael, who denied aspiring to the throne. In early 1034 Romanos became ill and it was widely believed that Zoe and Michael were conspiring to have him poisoned. On 11 April Romanos was found dying in his bath. According to court official and later chronicler
Michael Psellus some of his retinue had "held his head for a long time beneath the water, attempting at the same time to strangle him".
John Scylitzes writes as a simple fact that Romanos was drowned on Michael's orders.
Matthew of Edessa's account has Zoe poisoning Romanos. Zoe and Michael were married on the same day that Romanos III died. The next day they summoned the
Patriarch Alexios I to officiate at the coronation of the new emperor. Although he initially refused to co-operate, the payment of 50 pounds of gold helped change his mind. Zoe's new husband took power as Michael IV. His abrupt rise to power had left him unprepared to rule, and he delegated much of the business of governing to his brother, the eunuch
John the Orphanotrophos. Although Zoe believed Michael would prove to be a more devoted husband than Romanos, she was mistaken. Fearing that Zoe would turn on him as she had turned on his predecessor, Michael excluded her from politics and sent her back to the
gynaeceum, where she was kept under strict surveillance. The disgruntled empress tried to alter the balance of power by conspiring against John, without success. Michael's health was bad throughout his reign, and by 1041 it was obvious that he was dying. Eager to ensure that power remained in his hands, John the Eunuch forced Zoe to adopt his nephew
Michael Kalaphates. On 10 December 1041, Michael IV died, refusing to the last to see his wife who begged that she be allowed to visit him one more time. Kalaphates was crowned emperor as Michael V. Although he had pledged to respect Zoe, Michael V eventually banished her to a monastery on
Principus, an island in the Sea of Marmara, on charges of attempted regicide. She was forcibly tonsured and sworn into a religious order. This treatment of the legitimate heir to the Macedonian Dynasty caused a popular uprising in Constantinople. Michael V, desperate to keep his throne, brought Zoe back from Principus and displayed her to the people, but his insistence that he continue to rule alongside her was in vain. On 19 April 1042, the mob revolted against Michael V in support of not only Zoe but also Theodora. A delegation headed by
Patrician Constantine Cabasilas went to the monastery at Petrion to convince Theodora to become co-empress alongside her sister. Theodora had become accustomed to a life of religious contemplation and tried to refuse the proposal, but the delegates brought her forcibly back to the capital. At an assembly in
Hagia Sophia the people escorted a furious Theodora and proclaimed her empress along with Zoe. They were both crowned on 21 April and Michael V was forced to take refuge in a monastery. ==Ruling with Theodora and Constantine IX: 1042–1050==