Ach, this is one of my rabbitholes...

So, yes, cast iron works -just fine- for pizza and depending on how you gimmick with the crust properties you can do all kinds in a skillet.

However there's a -lot- of other options.

My personal preference relies on a 'pizza stone' - a piece of ceramic that you leave in the oven to heat up, and then you slide the pizza on it. Works amazingly! gets you a nice crisp bottom to the crust.

However, Gryph's unlikely to have a commercial one of those - but he's -extremely- likely to have, in his pile of building supplies for a fancy european house, a metric assload of -slate- for the roof. And it just so happens that slate will work -just fine- in an oven*

Alternatively, you can just slap it on a grill; with the right crust composition and without too many toppings it'll do -well enough- that you can get acceptable results on a regular BBQ.

Alternatively, given this is a manor house, it's likely they would have a dedicated bread oven, which would function much like a professional pizza oven - and it's not like a peel would be that hard to fashion.

So if anything, Gryph's likely to have the means to make -more legitimate pizza- than I can in my house.

* provided it's thick enough. Very thin pieces will shatter.