This list is partially incomplete in the tenth century and the chronology and dates of the various countships are often uncertain. They were only counts from about 1013, lords before. • before 924
Theophylact I • until 924
Alberic I, (
Consul) son-in-law of Theophylact I • 924–954
Alberic II, son of Alberic I • before 1013
Gregory I, (
Excellentissimus vir – Praefectus navalis) son of Alberic II • until 1012
Theophylact II, son of Gregory I • 1012–1024
Romanus, (
Consul et dux, senator) brother of Theophylact II and son of Gregory I • 1024–1032
Alberic III, (
Imperialis palatii magister Consul et dux – Comes sacri palatii Lateranensis) brother of Theophylact II and Romanus • 1032–1045
Theophylact III son of Alberic III • 1044–1058
Gregory II, (
Consul, nobilis vir, senator Comes Tusculanensis) son of Alberic III • 1058 – c. 1108
Gregory III, (
Comes Tusculanensis Consul, illustris) son of Gregory II • c. 1108 – 1126
Ptolemy I (Tolomeo I), (
Consul, comes Tusculanus) son Gregory III • 1126–1153
Ptolemy II (Tolomeo II), (
Illustrissimus, dominus Consul et dux) son of Ptolemy I • 1153 – c. 1167
Jonathan, (
Comes de Tusculano) co-ruler with Raino son of Ptolemy II • 1153–1179
Raino, (
Nobilis vir, dominus) brother of Jonathan, co-ruler with Jonathan ==Tusculan popes==