Protestant churches, in terms of their historical inception, are relatively younger than many of the European churches, particularly those rooted in Roman Catholicism, Eastern Orthodoxy, and other ancient Christian traditions. The Protestant Reformation, led by figures such as Martin Luther and John Calvin, began in the 16th century, giving birth to Protestant denominations. In contrast, many European churches, especially in countries like Italy, Greece, and France, have their origins tracing back over a millennium, with some established as early as the 4th century. These churches often carry with them a rich tapestry of history, art, and architectural significance, bearing witness to centuries of Christian worship and tradition.