Alaptolma 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 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. Wikipedia
The definitive Wikipedia entry for Alaptolma. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Alaptolma