Prussia's last king and Germany's last Kaiser was born in Potsdam on January 27, 1859, the son of Prince Frederick of Prussia and Princess Vicky, Queen Victoria's eldest child. William was born with a withered arm and suffered from cerebral palsy; many historians have sought in this clue a clue to his behavior later in life. He was believed mad by some, eccentric by others. Possessed of a ferocious temper, he was prone to reactionary statements, often...