Lewis & Short

2. Pēgăsus, i, m., a celebrated jurist in the reign of the emperor Vespasian, Dig. 1, 2, 2, § 47; Juv. 4, 77.
Hence,

  1. B. Pē-găsĭānus, a, um, adj., Pegasian: senatus consultum, Just. Inst. 2, tit. 23.