Translation of "Unobserved" in Portuguese

Behind the palace, unobserved and free, / there stood a door, a secret thoroughfare / through Priam's halls. Here poor Andromache / while Priam's kingdom flourished and was fair, / to greet her husband's parents would repair / alone, or carrying with tendance fain / to Hector's father Hector's son and heir.

Uma porta traseira camuflada, / não vista pelos gregos, dava acesso / a um passadiço entre os dois prédios do palácio, / por onde costumava Andrômaca, a infeliz, / nos bons tempos sozinha transitar, / em visita a seus sogros, ou levando / o pequeno Astianaz ao caro avô.