Martin Luther, a 16th-century reformer who challenged the authority of the Roman Catholic Church and sparked the Protestant Reformation. John Wesley, an 18th-century evangelist and theologian who founded the Methodist movement and emphasized the importance of personal holiness and social justice. William Wilberforce, a 19th-century British politician who led the movement to abolish the slave trade and promote Christian values in public life. Amy Carmichael, a 20th-century missionary who founded a ministry to rescue and care for children in India, serving with sacrificial love and unwavering faith.