The Traditional Roman Hymnal, published by SSPX Winnipeg, Manitoba, Canada, is the standard hymnal used in all SSPX Chapels. On page 285 & 286, one will find the prayers for the pope, Oremos Pro Pontifice. The English translation of the prayer is:
Let us pray for our Pontiff (Name)
May the Lord preserver him and enliven him, and make him blessed upon the earth
and may He not hand him over to the will of his enemies.
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How old is that prayer?