On 30 November 147, Faustina gave birth to a girl named Domitia Faustina. She was the first of at least thirteen children (including two sets of twins) that Faustina would bear over the next twenty-three years. The next day, 1 December, Antoninus gave Marcus the tribunician power and the "imperium" – authority over the armies and provinces of the emperor. As tribune, he had the right to bring one measure before the senate after the four Antoninus could introduce. His tribunician powers would be renewed with Antoninus's on 10 December 147. The first mention of Domitia in Marcus's letters reveals her as a sickly infant. 'Caesar to Fronto. If the gods are willing we seem to have a hope of recovery. The diarrhea has stopped, the little attacks of fever have been driven away. But the emaciation is still extreme and there is still quite a bit of coughing'. He and Faustina, Marcus wrote, had been 'pretty occupied' with the girl's care. Domitia would die in 151.