Tomislav became King of Croatia by the year 925.
He was the first Croatian ruler whom the Papal chancellery honoured with the title "king".
It is generally said that Tomislav was crowned in 924 or 925, but is not known when, where, or by whom he was crowned.
The letters in which Tomislav was called a king were preserved in a version of Thomas the Archdeacon's History of Salona.
In a note preceding the text of the Council conclusions in Split in 925 it is written that Tomislav is the king "in the province of the Croats and in the Dalmatian regions" (in prouintia Croatorum et Dalmatiarum finibus Tamisclao rege).
In the 12th canon of the Council conclusions in 925 the ruler of the Croats is called "king" (rex et proceres Chroatorum), while in a letter sent by Pope John X Tomislav is named "King of the Croats" (Tamisclao, regi Crouatorum).
Although there are no inscriptions of Tomislav to confirm the title, later inscriptions and charters confirm that his 10th century successors called themselves "kings".

In older historiography it was assumed that Tomislav was crowned at the field of Duvno near Tomislavgrad (named "Tomislav's City" in his honour), although there are no contemporary records of this event.
This conclusion was derived from the Chronicle of the Priest of Duklja where a coronation of an alleged King "Svatopluk" (in a later version of the chronicle he was named "Budimir") and a council held on the field of Dalma were described.
Some historians in the 19th century theorized that Tomislav and Svatopluk were in fact the same person, or that the author mistakenly wrote the wrong name of the King.
Other theories suggest that the Pope or one of his representatives had Tomislav crowned before the Church Council of Split in 925, or that Tomislav crowned himself.
Tomislav became King of Croatia by the year 925. He was the first Croatian ruler whom the Papal chancellery honoured with the title "king". It is generally said that Tomislav was crowned in 924 or 925, but is not known when, where, or by whom he was crowned. The letters in which Tomislav was called a king were preserved in a version of Thomas the Archdeacon's History of Salona. In a note preceding the text of the Council conclusions in Split in 925 it is written that Tomislav is the king "in the province of the Croats and in the Dalmatian regions" (in prouintia Croatorum et Dalmatiarum finibus Tamisclao rege). In the 12th canon of the Council conclusions in 925 the ruler of the Croats is called "king" (rex et proceres Chroatorum), while in a letter sent by Pope John X Tomislav is named "King of the Croats" (Tamisclao, regi Crouatorum). Although there are no inscriptions of Tomislav to confirm the title, later inscriptions and charters confirm that his 10th century successors called themselves "kings".
In older historiography it was assumed that Tomislav was crowned at the field of Duvno near Tomislavgrad (named "Tomislav's City" in his honour), although there are no contemporary records of this event. This conclusion was derived from the Chronicle of the Priest of Duklja where a coronation of an alleged King "Svatopluk" (in a later version of the chronicle he was named "Budimir") and a council held on the field of Dalma were described. Some historians in the 19th century theorized that Tomislav and Svatopluk were in fact the same person, or that the author mistakenly wrote the wrong name of the King. Other theories suggest that the Pope or one of his representatives had Tomislav crowned before the Church Council of Split in 925, or that Tomislav crowned himself.
Tomislav of Croatia