Rumbaudas Valimantaitis (Polish: Rumbold [Lambert] Wolimuntowicz; died in 1432) was an influential Lithuanian noble of Zadora coat of arms.
[1] In 1409, he became Elder of Samogitia and instigated the Second Samogitian Uprising on orders of Vytautas, Grand Duke of Lithuania.
The uprising grew into the Polish–Lithuanian–Teutonic War and it is believed that Rumbaudas commanded Samogitian troops in the Battle of Grunwald (1410).
In 1413, he was among Lithuanian nobles negotiating the status of Samogitia with Benedict Makrai, a mediator appointed by Sigismund of Luxemburg.
After the coup against Švitrigaila in August 1432, Sigismund even appointed Jaunius, brother of Rumbaudas, as Voivode of Vilnius.