Transylvania population of Transylvania for the years 1830-1840 the majority were 62.3% Romanians and 23.3% Hungarians. In the last quarter of the 19th century, the Hungarian population of Transylvania increased from 24.9% in 1869 to 31.6%, as indicated in the 1910 Hungarian census. At the same time, the percentage of Romanian population decreased from 59.0% to 53.8% and the percentage of German population decreased from 11.9% to 10.7%, for a total population of 5,262,495. Magyarization policies greatly contributed to this shift. The percentage of Romanian majority has significantly increased since the declaration of the union of Transylvania with Romania after World
Principality of Transylvania (1570–1711) West and north Royal Hungary, Ottoman Hungary, and the Eastern Hungarian Kingdom under Ottoman suzerainty, which later became the Principality of Transylvania where Austrian and Turkish influences vied for supremacy for nearly two centuries. The Hungarian magnates of Transylvania resorted to policy of duplicity in order to preserve independence. Transylvania was administrated by Isabella, John Sigismund's mother from 1541 to 1551, when it fell for 5 years (1551–1556) under Habsburg rule. The House of Zapolya gained again the control of Transylvania in 1556, when the Diet of Szászsebes elected Sigismund as prince of Transylvania. Transylvania was now beyond the reach