The House of Erdődy de Monyorókerék et Monoszló is the name of an old Hungarian-Croatian noble family with possessions in Hungary and Croatia. Elevated to the Hungarian nobility in 1459, the family was subsequently raised to the rank of Count in 1485. In 1565, the family was then recognised by the Habsburg monarchy, which granted them the title Reichsgraf / Gräfin. The family was raised again in 1566 to the rank of Reichfürst; but the death the following year of the recipient prevented the title from being registered and so it did not become hereditary.

A perpetual count was a head or an ispán of a county in the Kingdom of Hungary whose office was either hereditary or attached to the dignity of a prelate or of a great officer of the realm. The earliest examples of a perpetual ispánate are from the 12th century, but the institution flourished between the 15th and 18th centuries. Although all administrative functions of the office were abolished in 1870, the title itself was preserved until the general abolition of noble titles in Hungary in 1946.