Anew and powerful class of people known as arose from the desire to posses the items people saw while on the crusades in the holy land

The answer is merchants. Merchants were known as a new and powerful class of individuals during the past eras. They arose due to the reason of their desire to own the attractive objects individuals saw while on the Crusades in the Hold Land. A Merchant is defines as an individual who buys and sells commodities/services or products for profit, he or she may also be considered as a dealer or a trader.

to fight against injustice and class division

your answer is

to dominate europe

and i know for a fact it can't be the others