Pseudocardinals are called these cardinals, created by the antipopes

Antipope

An antipope is a person who opposes a legitimately elected or sitting Pope and makes a significantly accepted competing claim to be the Pope, the Bishop of Rome and leader of the Roman Catholic Church. At times between the 3rd and mid-15th century, antipopes were typically those supported by a...

. Their state, like the state of the antipopes is disputed. There are many pseudocardinals created during the controversy between the Holy See

Holy See

The Holy See is the episcopal jurisdiction of the Catholic Church in Rome, in which its Bishop is commonly known as the Pope. It is the preeminent episcopal see of the Catholic Church, forming the central government of the Church. As such, diplomatically, and in other spheres the Holy See acts and...

 and the Holy Roman Empire

Holy Roman Empire

The Holy Roman Empire was a realm that existed from 962 to 1806 in Central Europe.It was ruled by the Holy Roman Emperor. Its character changed during the Middle Ages and the Early Modern period, when the power of the emperor gradually weakened in favour of the princes...

 and during the Western Schism

Western Schism

The Western Schism or Papal Schism was a split within the Catholic Church from 1378 to 1417. Two men simultaneously claimed to be the true pope. Driven by politics rather than any theological disagreement, the schism was ended by the Council of Constance . The simultaneous claims to the papal chair...

. Some of them had switched their obedience. The legitimacy of the popes of the different obediences during the Western Schism was not a clear matter for their contemporaries. The terms antipope and pseudocardinal or anticardinal were not used at that time. This is how some modern Roman Catholic historians call them.