How were medieval knights able to afford such an expensive lifestyle?

During the medieval period, knights were members of the nobility and were typically wealthy landowners. They were able to afford their expensive lifestyle through the wealth and income generated by their lands and other assets. Knights also often received payments and gifts from their lords in return for their military service. Additionally, they could earn money and wealth through plunder and loot obtained during battles and wars. In some cases, knights may have also received financial support from the Church in the form of grants and donations. Overall, the combination of land ownership, military service, and other sources of income allowed knights to maintain their expensive lifestyle during the medieval period.