What was the papal motto of Pope St. Pius V?

Question

Past experience has literally forced me to do this:

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Answer 1

From the Vatican website:
"His sole concern was always to seek the greatest glory of God and the authentic good of his brethren, faithful to the motto "walk in the truth", which he made his own."

From the New Advent website:
...the great thought and the constant preoccupation of his pontificate seems to have been the struggle against the Protestants and the Turks...
On the day of the Battle of Lepanto, 7 Oct., 1571, he was working with the cardinals, when, suddenly, interrupting his work opening the window and looking at the sky, he cried out, "A truce to business; our great task at present is to thank God for the victory which He has just given the Christian army". He burst into tears when he heard of the victory, which dealt the Turkish power a blow from which it never recovered. In memory of this triumph he instituted for the first Sunday of October the feast of the Rosary, and added to the Litany of Loreto the supplication "Help of Christians". He was hoping to put an end to the power of Islam by forming a general alliance of the Italian cities Poland, France, and all Christian Europe, and had begun negotiations for this purpose when he died of gravel, repeating "O Lord, increase my sufferings and my patience!"