sentences:  Tomislav (910–928) became king of Croatia by 925.The chief piece of evidence that Tomislav was crowned king comes in the form of a letter dated 925, surviving only in 16th-century copies, from Pope John X calling Tomislav "rex Chroatorum".According to "De Administrando Imperio", Tomislav's army and navy could have consisted approximately 100,000 infantry units, 60,000 cavaliers, and 80 larger ("sagina") and 100 smaller warships ("condura"), but generally isn't taken as credible.