According to medieval Catholic teachings, what was the intermediate realm where Christians were punished for repented sins that had not been expiated before their deaths?

Numerous Christians have suffered persecutions by non-Christians and even other Christians of diverse or more or less strict beliefs during the history of Christianity.

Such persecutions have or had varying degrees of intensity, from unsecured arrest, diminishing public rights, imprisonment, flogging and torture, to execution, called martyrdom, through the payment of a supplementary tax - as the case. of the Mozarabs - the confiscation of their property or even the destruction of their property, their art, their books and their symbols or the incitement to renounce their principles and betray other Christians.