(CNN) -- Pope John XXIII and Pope John Paul II are to be made into saints this weekend in an unprecedented double papal canonization. 

While millions across the world remember John Paul II affectionately, John XXIII -- known as "The Good Pope" -- may not be as familiar. Here are five things you need to know about the much-loved pontiff. 

1. He was born in poverty -- and proud of it 

Angelo Giuseppe Roncalli, the man who would become Pope John XXIII, was the third of 13 surviving children born to a family of farmers in the tiny village of Sotto il Monte, near Bergamo, northern Italy in November 1881. 

Roncalli left home to study for the priesthood at the age of 11, but even after he became Pope in 1958 at the age of 76 he eschewed the trappings of his position, and refused to take advantage of it either for himself or his family. 

In his last will and testament, Pope John XXIII wrote: "Born poor, but of humble and respected folk, I am particularly happy to die poor. 

"I thank God for this grace of poverty to which I vowed fidelity in my youth... which has strengthened me in my resolve never to ask for anything -- positions, money or favors -- never either for myself of for my relations and friends." 

When John XXIII died in June 1963 he was mourned around the world as "Il Papa Buono" ("The Good Pope"). He left his personal "fortune" to the surviving members of his family -- they each received less than $20. 
How much money did he leave to his family?
they each received less than $20