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

According to the medieval Gesta Hungarorum

Gesta Hungarorum

Gesta Hungarorum is a record of early Hungarian history by an unknown author who describes himself as Anonymi Bele Regis Notarii , but is generally cited as Anonymus...

, Alaptolma built a castle on the estate of his father, Ketel

Ketel

Ketel is a legendary Magyar tribal chieftain who lived at the end of the 9th century.According to the medieval Gesta Hungarorum, the leader of the Magyars, Árpád, donated a large estate to Ketel along the Danube and Váh rivers where he settled with his people. Today, Ketel is honoured as the...

, at the confluence of the Danube

Danube

The Danube is a river in the Central Europe and the Europe's second longest river after the Volga. It is classified as an international waterway....

 and Váh

Váh

The Váh is the longest river in entire Slovakia. A left tributary of the Danube river, the Váh is 406 km long, including its Čierny Váh branch...

 (Hungarian: Vág) rivers. This ancient castle became the core of the town of Komárom

Komárom

Komárom is a city in Hungary on the right bank of the Danube in Komárom-Esztergom county.The city of Komárom was formerly a separate suburban village called...

/Komárno

Komárno

Komárno is a town in Slovakia at the confluence of the Danube and the Váh rivers. Komárno was formed from part of a historical town in Hungary situated on both banks of the Danube. Following World War I, the border of the newly created Czechoslovakia cut the historical, unified town in half,...

. Today Ketel and Alaptolma are honoured as the legendary founders of the city.