Original: Holy Roman Empire Personal union with Spain from 1519 to 1556 under Charles V. Personal union with Hungary from 1526 to 1806 Hungary Personal union with Poland and Bohemia 1301 - 1305 Personal union with Poland from 1370 to 1382 under the reign of Louis the Great .
Simplified: Holy Roman Empire Personal union with Spain from 1519 to 1556 under Charles V. Hungary Personal union with Croatia from 1102 to 1918 .