Note 56.3 — LOS INTERESES CREADOS
Reading edition
ser llegado. A relic of the auxiliary ser with intransitive verbs of motion. This construction is common in Old Spanish, rare in Cervantes, and almost non-existent now. A few survivals occur even in prose, and of such survivals es llegado is perhaps the most common. See Bello-Cuervo, § 1119.