There have been 16 popes named Gregory and none were martyrs.
Both Peter and Paul were martyred in Rome.
George was martyred. He martyred no one.
Yes, Christopher was martyred about the year 251.
Yes, he was martyred for being a Christian.
Gregory is not a patron saint.
Saint Agnes was martyred in Rome.
Saint Pedro Calungsod was martyred in 1672 at the age of 17.
Yes, both Saint Lorenzo Ruiz and Blessed Pedro Calungsod were martyred for their faith. Saint Lorenzo Ruiz was martyred in Japan in 1637, while Blessed Pedro Calungsod was martyred in Guam in 1672. They are both revered as Filipino martyrs and saints in the Catholic Church.
Saint Isaac Jogues was martyred in America - Canada.
Please specify which Saint Gregory. There are several.
Gregory is recognized as a saint in the Orthodox religion but not in the Catholic.
Euphemia