Swiss soldiers began guarding Vatican City in 1506.
At the time Swiss Cantons were very poor, and men started emigrating to other places in hopes of finding a better future. Most of the jobs available to immigrants were as soldiers. Swiss soldiers were seen as loyal, courageous, and hard-working, and as a result Pope Julius II invited them to protect him and the Vatican.
“Castles are places were plots were hatched, marriages were consummated, murders carried out, royal babies born, and so on. With castles, you are never short of fascinating things to talk about.”