Maslama ibn Abd al-Malik
In July 718, Maria gave birth to Constantine during an ongoing Siege of Constantinople by Maslama ibn Abd al-Malik, a general of the Umayyad Caliphate. The siege was broken by August of the same year and the Umayyad forces retreated. On 25th, Maria was granted the title of "Augusta" and her son was baptised by Patriarch Germanus I of Constantinople. Constantine was proclaimed co-emperor in August 720.