Ghiscari legion

"In the dawn of days, the city of Ghis and poured forth its legions across the continent of Essos. With their lock-step discipline and absolute obedience, they grounded entire nations beneath their boots... and planted the harpy in every corner of the Known World."

- Ser Jorah Mormont

Ghiscari legions were the traditional military units of the Ghiscari Empire. Trained to fight with spear, sword and shield, they were the backbone of the Empire's domination over the continent of Essos.

Regardless of their disciple and obedience the legions were no match for the dragons of the nascent Valyrian Freehold. Even after the Doom of Valyria and the nigh-extinction of dragons throughout east and central Essos, the age of foot soldiers was considered dead in face of the emergence of Dothraki khalasars.

The formation, armor and fighting technique of the Unsullied, slave warrior-eunuchs trained in Astapor, is based on that of the ancient Ghiscari legions. In fact, the Good Masters of Astapor insist the Unsullied are the legions come again.

In the books
In the A Song of Ice and Fire books not only the Unsullied continue the tradition of the Ghiscari legions. The city of New Ghis, whose leadership seeks to rebuild the Ghsicari Empire under their leadership, has formed legions armed and organized in the same manner as the Unsullied, but thei are free citizens that serve in terms of three years.