He got up, however, and as there came no more crows, or night-birds like the bats that flew out at the same time with the crows, the cousin and Sancho giving him rope, he lowered himself into the depths of the dread cavern; and as he entered it Sancho sent his blessing after him, making a thousand crosses over him and saying, "God, and the Pena de Francia, and the Trinity of Gaeta guide thee, flower and cream of knights-errant.
There are no more uses of "The Trinity" in the book.
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In the popular novel, The Shack, three characters represent the Trinity.
For him, all that was left of the Trinity, was the holy spirit that gloriously filled the world — and especially mankind.