"he spent a great deal of time travelling"

It was a traditional custom of the 16th to 19th centuries for young men of Charles' class to undertake a journey around Europe, referred to as a "Grand Tour". This was supposed to broaden their horizons and complete their education, as well as function as a rite of passage, a last period of independence and freedom after which it was expected that they would marry and take up their social and familial responsibilities.

There was a standard route, which took in Greece and Italy, in tribute to their importance in ancient times, as well as France, Germany, Switzerland, Spain and Portugal.  Some travellers, like Charles, penetrated further south and east, visiting the modern Middle East and Turkey.