During his youth, Zappas joined the Greek War of Independence (1821–1832), achieving the rank of Major and fighting in several significant battles. Following Greek independence, he moved to Wallachia where he had a successful career as a businessman, becoming one of the richest men of that time in Eastern Europe. Aside from being the only major sponsor of the Olympic revival at that time, Zappas's philanthropy also included contributions toward the foundation of several Greek institutions and schools as well as sports and exhibition facilities.