Bosporan expansion began after Spartokos I, the first Spartocid (and after whom the dynasty is named) took power and during his seven-year reign, established an aggressive expansionist foreign policy that was followed by his successors.

It is possible that Spartokos I was a Thracian mercenary who usurped the Archaeanactids, a Greek dynasty of Bosporan rulers who had ruled for 40 years.

[3] Although disputed, some sources say that Spartokos may have been related to the Odrysian royal dynasty as some members included the names of "Sparatokos"[4] and may have sought influence in other parts of the Black Sea.

[15] At the same time as he was trying to gain influence with the Sindoi, Satyros had laid siege to Theodosia, a city that was a commercial rival to Panticapaeum due its ice-free ports and a possible ally of Heraclea Pontica.

After that, Gorgippos and Leukon focussed on their on-going war with Theodosia and Heraclea Pontica and further expansion to the west and south of Panticapaeum.

Leukon suspected that there would be an attempt to remove him from the throne, and rallied the merchants to his aid and borrowed whatever money he could from them.

[20] After putting down a conspiracy against his throne, in around 360 BC, some time after his unsuccessful first attempt at subjugating the city of Theodosia, Leukon laid siege to Theodosia once more when the Heracleotes had recently left, possibly due to Clearchus of Heraclea making himself tyrant of Heraclea and a change of power from an oligarchy to a tyranny.

[24] The Sindike Kingdom was in the midst of a civil war, as Oktamasades, the son of Hekataios, had taken the throne for himself.

Leukon, aiming to annex it into the Bosporan Kingdom, waged war against Oktamasades and quickly defeated him in the Battle of Labrytai, ultimately driving him out into Scythia.

Memnon retreated to a nearby hill and hid some of his troops, to make it look like that there was discord in his army.

Through his marriage to his paternal cousin, Komosarye, a daughter of Gorgippos, Paerisades achieved the title "King of the Sindians".

Satyros, Leukon, and Gorgippos had established a dynasty that would rule the Bosporan Kingdom for three centuries, and would enjoy relative peace until 310 BC, when Paerisades I died.