This letter was shortly before the second of Sulpicius' basilicas was dedicated, thus in 403 or, even more probably, in 404.
Primuliacum was one of Sulpicius estates which he did not sell when he was rejecting his wealth . Its exact location was lost. Recently, Frank Riess (Riess 2013: 66-69) has, once again, proposed the identification of Primuliacum with Elusio, present-day Monferrand, which Paulinus mentions in his first letter to Sulpicius (). The hypothesis that it served also as the later site of Sulpicius’ monastery is strengthened by the recent excavations of two 4th or 5th century basilicas, positioned side by side, just as in Primuliacum (see the beginning of letter 32 ).
It seems that the remains of Clarus were buried beneath the altar of the smaller of two basilicas in Primuliacum (see ), and the relics of martyrs (and, possibly, of the True Cross) benath the altar of the larger one.