Massaman curry (kaeng in thia) matsaman, is a rich, relatively mild Thai curry being a fusion dish. The spiciness of a Thai curries depends on the amount of chili used in the making of the paste, and the amount of paste you add, even within one type of curry the spiciness can be very different, you may find that that a curry you  would eat in Europe  is fairly mild however compared to Thailand where this would be much more spicy