Michael Grant was an English classisist, numismatist, and author of numerous popular books on ancient history. His 1956 translation of Tacitus’s Annals of Imperial Rome remains a standard of the work. He once described himself as "one of the very few freelances in the field of ancient history: a rare phenomenon". As a popularizer, his hallmarks were his prolific output and his unwillingness to oversimplify or talk down to his readership.
“During the long reign of Arcadius's son Theodosius II (408-450) that followed, power at Constantinople was chiefly exercised by his mother Pulcheria. ”
Pulcheria was Theodosius II's sister, not his mother.