https://en.wikipedia.org/wiki/Grand_Tour

"Three hundred years ago, wealthy young Englishmen began taking a post-Oxbridge trek through France and Italy in search of art, culture and the roots of Western civilization. With nearly unlimited funds, aristocratic connections and months (or years) to roam, they commissioned paintings, perfected their language skills and mingled with the upper crust of the Continent."

So you're a rich English dude in the 17th century. You decide to go on your Grand Tour.

How do you pay for all your stuff? Your travels, your overnight stays, your food, your clothes, your commissioned paintings? Do you carry a chest full of gold coins in it? What about getting change between two different currencies?

How was money managed for international travelers before the advent of modern banking?