[4] Of the total Hungarian minority, Unitarians represent 4.55%, being the third denominational group after members of the Reformed Church in Romania (47.10%) and Roman Catholics (41.20%).

[4] The vast majority of church adherents live in Transylvania, mostly between Sighișoara (Segesvár) and Odorheiu Secuiesc (Székelyudvarhely), more or less around Dârjiu (Székelyderzs).

[7] The Church attracted suspicion from all other established religions, Roman Catholic as well as Protestant, with both camps deeming it heretical.

Andrzej Wiszowaty Jr., great-great-grandson of Fausto Sozzini, was one of the Polish exiles who taught at the Unitarian College in Cluj-Napoca, in the period in the 1730s when the church was reorganized and strengthened by Mihály Lombard de Szentábrahám, author of the church's official statement of faith, the Summa Universae Theologiae Christianae secundum Unitarios.

[4] During World War II, when Hungary ruled Northern Transylvania, the church, to prove its devotion to the official state ideology, engaged in anti-Semitic activity, despite having previously accepted many converts of Jewish origin.

[11] The locality of Dârjiu is home to a 13th-century fortified church, later reformed as Unitarian, which is on UNESCO's World Heritage List.

Murals, dating back to the Roman Catholic period, show King Ladislaus I of Hungary's legend: Cumans broke into the Kingdom of Hungary; Duke Ladislaus, along with his cousin King Solomon, rode against them and freed a girl believed to be daughter of a Hungarian nobleman from a Cuman's hands.