Eunomius, native of Cappadocia, together with his disciple Aetius, was the exponent of the version of Arianism called "anomoianism". They held and taught the doctrine that the Son is unlike ("anomoios") the Father. Eunomius was ordained in 360 bishop of Cyzicus in Mysia (north-western Asia Minor). He was condemned in 383; he died in 394. See Simonetti 2014: 1.867.
The law was directed to the diocese of Orient but because it was indcluded in the Theodosian Code, it also has some relevancy to the West.