Alaptolma (or Tolma) is a legendary Magyar tribal chieftain who lived in the first part of the 10th century.

According to the medieval Gesta Hungarorum, Alaptolma built a castle on the estate of his father, Ketel, at the confluence of the Danube and Váh (Hungarian: Vág) rivers. This ancient castle became the core of the town of Komárom/Komárno. Today Ketel and Alaptolma are honoured as the legendary founders of the city.

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