Germanus, called "patricius" (Greek: πατρίκιος), was a leading member of the Byzantine Senate during the reign of Maurice.
Other than a wife called Leontia by Theophanes the Confessor, there is no named relative of Germanus. His name has led to a possible identification with a similarly named son of Germanus (d. 550) and Matasuntha. But said son has also been identified with Germanus, a son-in-law of Tiberius II Constantine and Ino Anastasia. The common name "Germanus" may hint to these figures being related to each other but there is insufficient evidence for identifications.
In November 601 or more likely, in February 602, an unnamed daughter of Germanus married Theodosius, the eldest son of Maurice and Constantina. The marriage was recorded by Theophylact Simocatta, Theophanes the Confessor, the Chronicon Paschale, Joannes Zonaras and Georgios Kedrenos.
On 2 February 602, Theophylact records Germanus rescuing the life of Theodosius from a rioting mob in Constantinople, angry over a food shortage. Later that year, Germanus and Theodosius went hunting to Callicrateia, a brief distance from Constantinople. There they received correspondence from the rebellious army of Thrace. The rebels demanded the deposition of Maurice and offered their support to elevate either Theodosius or Germanus to the throne.
Germanus was soon accused of treason by Maurice. The emperor suspected him of being responsible for the ongoing revolt. Besides the incriminating letter, there was another act pointing to the rebels being allied to Germanus. They were reportedly seizing all horses outside Constantinople, but had left Germanus' horses alone. Germanus pleaded for his innocence in vain. Theodosius convinced his father-in-law to flee before facing the wrath of Maurice.