This is a unique structure in the entrance to the Monastery of San Juan de Los Reyes in Toledo. Was checking on the meaning of the entry there and found it here
Putasne mortuus homo rursum vivat? cunctis diebus quibus nunc milito, expecto donec veniat immutatio mea.
And from the translation given there, I guess this is the one,
Ah, if the dead might live again! Then I could wait willingly enough, all the time of my campaigning, till I were relieved at my post;
Wonder who it was !!!
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