Ferdinand I

• Ferdinand I of Castile and Leon[?] (ca. 1000-1065, king from 1037)
• Ferdinand I of Aragon[?] (1379-1416, king from 1412)
• Ferdinand I of Naples (ca. 1424-1494, king from 1458)
• Ferdinand I of Germany (1503-1564, emperor from 1556)
• Ferdinand I of the Two Sicilies (1751-1829, king of Naples from 1759)
• Ferdinand I of Austria (1793-1875, emperor from 1835)
• Ferdinand of Romania (1865-1927, king from 1914)
• Ferdinand of Bulgaria (1861-1948)

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