Noun
titulus (plural tituli)
A caption, title or other inscription, especially an Ancient Roman type.
Amateur historians Bertram Fields and Sir Clements Markham have claimed that he may have been involved in the murder of the Princes in the Tower, as the repeal of Titulus Regius gave the Princes a stronger claim to the throne than his own. Source: Internet
He located lost archival material, including the Titulus Regius, but also claimed to have seen a letter written by Elizabeth of York, according to which Elizabeth sought to marry the king. Source: Internet
Parliament issued a bill, Titulus Regius ("The Title of the King"), in support of this position. Source: Internet