Nevertheless, among many other representations made to him, the housekeeper said to him, "In truth, master, if you do not keep still and stay quiet at home, and give over roaming mountains and valleys like a troubled spirit, looking for what they say are called adventures, but what I call misfortunes, I shall have to make complaint to God and the king with loud supplication to send some remedy."
There thou goest, thou dare-devil of the earth, heart of steel, arm of brass; once more, God guide thee and send thee back safe, sound, and unhurt to the light of this world thou art leaving to bury thyself in the darkness thou art seeking there;" and the cousin offered up almost the same prayers and supplications.
…up a prayer to heaven, imploring God to aid him and grant him success in this to all appearance perilous and untried adventure, and then exclaimed aloud, "O mistress of my actions and movements, illustrious and peerless Dulcinea del Toboso, if so be the prayers and supplications of this fortunate lover can reach thy ears, by thy incomparable beauty I entreat thee to listen to them, for they but ask thee not to refuse me thy favour and protection now that I stand in such need of them.
There are no more uses of "supplicate" in the book.
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He supplicated the King for forgiveness
The woman walked past him, up the steps, onto the porch, into the house, and the man bowed his head as if in prayer, then lifted his head as if in supplication.