[6] Theodore gradually built up foreign relations with the Despotate of Vidin, which supported him in the struggle against King Charles I,[10] who was determined to unite the kingdom following his victory over the rival pretenders, Wenceslaus and Otto.
[11][12] According to a royal charter from 1317, Charles' loyal general Paul Szécsi led a campaign in autumn 1316 to besiege Miháld which defended by John Vejtehi, son of Theodore.
By that time Theodore was already in custody and taken tied up before the castle and dragged along the walls at the heels of a horse to persuade John to surrender the fort.
[6] According to Pál Engel, who dated the first siege to 1314, Charles I personally led a next royal campaign against the Vejtehis following his victories in Transylvania at the end of 1321 or early 1322.
John Vejtehi was pardoned and allowed to settle down his estate in Temes County, while Denis Szécsi, Paul's brother was installed castellan.
As Kristó says the significance of Miháld has appreciated when Charles transferred his residence from Buda to Temesvár (today Timișoara, Romania) in early 1315 and the struggle followed that.
In 1322 Theodore (now mentioned as magister) and his two sons donated the estates of Szentlászló and Szentmargit (today parts of Makó, Csongrád County) to his son-in-law, Gál Omori.
[11] Opposite him, historian István Vásáry points to the lack of clear evidence and the large time span between the Hungarian noble and the Bulgarian general named Ivan the Russian.