Very little is known about the details of Maximus' life prior to his involvement in the theological and political conflicts of the Monothelite controversy. Numerous Maximian scholars call substantial portions of the Maronite biography into question, including Maximus' birth in Palestine, which was a common seventh century trope to discredit an opponent. Moreover, the exceptional education Maximus evidently received could not have been had in any other part of the Byzantine Empire during that time except for Constantinople, and possibly Caesarea and Alexandria. It is also very unlikely that anyone of low social birth, as the Maronite biography describes Maximus, could have ascended by the age of thirty to be the Protoasecretis of the Emperor Heraclius, one of the most powerful positions in the Empire. It is more likely that Maximus was born of an aristocratic family and received an unparalleled education in philosophy, mathematics, astronomy, etc. It is true, however, that Maximus did not study rhetoric as he himself notes in the prologue to his Earlier Ambigua to John, to which his lack of high stylistic by Byzantine standards attests. Nevertheless, for reasons not explained in the few autobiographical details to be gleaned from his texts, Maximus left public life and took monastic vows at the monastery of Philippicus in Chrysopolis, a city across the Bosporus from Constantinople (later known as Scutari, the modern Turkish city of Üsküdar). Maximus was elevated to the position of abbot of the monastery.
When the Persians conquered Anatolia, Maximus was forced to flee to a monastery near Carthage. It was there that he came under the tutelage of Saint Sophronius, and began studying in detail with him the Christological writings of Gregory of Nazianzus and Dionysius the Areopagite. According to I P Sheldon Williams his achievement was to set these doctrines into a framework of Aristotelian logic, which both suited the temper of the times and made them less liable to misinterpretation. Maximus continued his career as a theological and spiritual writer during his lengthy stay in Carthage. Maximus was also held in very high esteem by the exarch Gregory, the eparch George and the population as a holy man, ostensibly becoming an influential unofficial political advisor and spiritual head in North Africa.
Involvement in Monothelite controversy
While Maximus was in Carthage, a controversy broke out regarding how to understand the interaction between the human and divine natures within the person of Jesus. This Christological debate was the latest development in disagreements that began following the First Council of Nicaea in 325, and were intensified following the Council of Chalcedon in 451. The Monothelite position was developed as a compromise between the dyophysitists and the miaphysists, who believed dyophysitism is conceptually indistinguishable from Nestorianism. The Monothelites adhered to the Chalcedonian definition of the hypostatic union: that two natures, one divine and one human, were united in the person of Christ. However, they went on to say that Christ had only a divine will and no human will (Monothelite is derived from the Greek for "one will"), which led some to charge them with Apollinarian monophysitism.
A silver hexagramma
showing Constans II with his son. Constans II supported Monothelitism
, and had Maximus exiled for his refusal to agree to Monothelite teachings.
The Monothelite position was promulgated by Patriarch Sergius I of Constantinople and by Maximus' friend and successor as the Abbot of Chrysopolis, Pyrrhus. Following the death of Sergius in 638, Pyrrhus succeeded him as Patriarch, but was shortly deposed owing to political circumstances. During Pyrrhus' exile from Constantinople, Maximus and the deposed Patriarch held a public debate on the issue of Monothelitism. In the debate, which was held in the presence of many North African bishops, Maximus took the position that Jesus possessed both a human and a divine will. The result of the debate was that Pyrrhus admitted the error of the Monothelite position, and Maximus accompanied him to Rome in 645. However, on the death of Emperor Heraclius and the accession of Emperor Constans II, Pyrrhus returned to Constantinople and recanted of his acceptance of the Dyothelite ("two wills") position.
Maximus may have remained in Rome, because he was present when the newly elected Pope Martin I convened the Lateran Council of 649 at the Lateran Basilica in Rome. The 105 bishops present condemned Monothelitism in the official acts of the synod, which some believe may have been written by Maximus. It was in Rome that Pope Martin and Maximus were arrested in 653 under orders from Constans II, who supported the Monothelite doctrine. Pope Martin was condemned without a trial, and died before he could be sent to the Imperial Capital.
Trial and exile
Maximus' refusal to accept Monothelitism caused him to be brought to the imperial capital of Constantinople to be tried as a heretic in 658. In Constantinople, Monothelitism had gained the favor of both the Emperor and the Patriarch of Constantinople. Maximus stood behind the Dyothelite position and was sent back into exile for four more years. During his trial he was accused of aiding the Muslim conquests in Egypt and North Africa, which he rejected as slander.
In 662, Maximus was placed on trial once more, and was once more convicted of heresy. Following the trial Maximus was tortured, having his tongue cut out, so he could no longer speak his rebellion, and his right hand cut off, so that he could no longer write letters. Maximus was then exiled to the Lazica or Colchis region of modern-day Georgia and was cast in the fortress of Schemarum, perhaps Muris-Tsikhe near the modern town of Tsageri. He died soon thereafter, on 13 August 662. The events of the trials of Maximus were recorded by Anastasius Bibliothecarius.