|St. Gallen, Stiftsbibliothek 391, 11.|
Compline/Daily devotions at the close of day, 1979 Book of common prayer.
we beg you to visit this house
and banish from it all the deadly power of the enemy.
May your holy angels dwell here
to keep us in peace,
and may your blessing be upon us always.
We ask this through Christ our Lord.
Night prayer on Sundays and solemnities, Liturgy of the hours.
Vísita, quæsumus, Domine, habitationem istam et omnes insídias inimíci ab ea longe repelle; angeli tui sancti habitent in ea, qui nos in pace custodiant, et benedíctio tua sit super nos semper. Per Christum.
Completorium, Post II vesperas dominicae et solemnitatum, Liturgia horarum.
This is not, of course, present in either Bruylants or Corpus orationum, nor have I yet tried to push it back behind the "980+" given in CANTUS (e.g. St. Gallen, Stiftsbibliothek 391, 11 (above, initial 4 ("V")), where it is associated with the dedication of a church).
Nikolaus Gihr (whose theological commentary may be worth a look) says of the date of composition only that "The wording shows clearly that this oration stems from a time when Compline was still prayed not in the church but in the cloister or the dormitory immediately before going to bed" (Prim und Komplet des römischen Breviers, liturgisch und aszetisch erklärt (Freiburg im Breisgau: Herder,1907), 333).