Days after her husband was killed in the Battle of Kronstadt on 17 July 1603, Anna Kornis gave birth to a son in Temesvár, which then belonged to the Ottoman Empire and was capital of the Temeşvar Eyalet (today Timișoara, Romania).
[1] Moses Székely attended the newly established Academicum Collgeium seu Gymnasium Illustre in Gyulafehérvár (today Alba Iulia, Romania).
[2] Gabriel Bethlen appointed Székely as judge of Udvarhelyszék and donated Marosújvár Castle (today Ocna Mureș, Romania) and the surrounding villages to him in 1620.
The new prince immediately confiscated the Geréb heirdom, overriding his predecessor's provision, and also accused Székely of being part of a conspiracy led by Dávid Zólyomi against him.
As the son of the late Moses Sr. he became a political trump in the hands of Nikolaus, Count Esterházy, the Palatine of Hungary and the Sublime Porte against George Rákóczi.
Although Székely was formally imprisoned at the Yedikule Fortress, he enjoyed a relatively high degree of freedom and was authorized to correspond with domestic supporters, which meant a constant threat to Rákóczi.
In addition, the late Gabriel Bethlen's brother, Stephen became a more significant potential pretender to the Transylvanian throne in the eyes of the Sublime Porte.