Dooku, of House Serenno, possessed the designation of Count of Serenno, a title previously borne by his father, Gora, and brother, Ramil, as the count governing the planet of Serenno. Ramil lost the title following the invasion of Serenno. Wilhuff Tarkin made reference to Dooku using this title during a shared meal. Dooku retained this title until his death in the Battle of Coruscant. Dooku's cape represented the Count of Serenno's emblem. By 10 BBY, Chrodber held the position of Count of Serenno and was present on the First Light, the yacht belonging to Crimson Dawn crime lord Dryden Vos.
The title Count of Serenno was initially introduced with Dooku in Star Wars: Episode II Attack of the Clones in 2002, the second movie in the Star Wars prequel trilogy. The Star Wars Character Encyclopedia: Updated and Expanded was the first to officially recognize the title within canon. In the novel Tarkin, the title appeared but with inconsistent capitalization, as "Count" was written in lowercase.