Óc Eo may have been the port known to the Romans as Cattigara.
Cattigara was the name given by the 2nd-century Alexandrian geographer Claudius Ptolemy to the land on the easternmost shore of the Indian Sea at (due to a scribal error) 8½° south of the Equator.

The name "Cattigara" was probably derived from the Sanskrit Kirti-nagara कीर्ति- नगर "Renowned City" or Kotti-nagara कोटि-नगर "Strong City".

Scholarship has now determined that Ptolemy's Cattigara was at 8½° north of the Equator and was the forerunner of Saigon as the main port and entrepot at the mouth of the Mekong.

John Caverhill deduced in 1767 that Cattigara was the Mekong Delta port Banteaymeas (now Hà Tiên), not far from Óc Eo.
The plea in 1979 by Jeremy H.C.S. Davidson for  "a thorough study of Hà-tiên in its historical context and in relation to Óc-eo" as indispensable for accurate understanding and interpretation of the site, still remains unanswered.

The eighteenth-century French geographer, Jean-Baptiste Bourguignon d'Anville, located Cattigara at the mouth of the Mekong (Cottiaris) River, where it is shown on his map, Orbis Veteribus Notus (The World Known to the Ancients).

The Swedish yachtsman and writer Bjorn Landström also concluded, from the sailing directions given by the ancient merchant and seafarer Alexander, that Cattigara lay at the mouth of the Mekong.

The "father of Early Southeast Asian History", George Coedès, has said: "By the middle of the 3rd century Fu-nan had already established relations with China and India, and it is doubtless on the west coast of the Gulf of Siam that the furthest point reached by Hellenistic navigators is to be found, that is the harbour of Kattigara mentioned by Ptolemy".
A.H. Christie said in 1979 that "the presence of objects, however few in number, from the Roman Orient" added some weight to the conjecture that Óc-eo was the Ptolemaic Kattigara.
The distinguished German classical scholar, Albrecht Dihle, supported this view, saying:
From the account of the voyage of Alexander referred to by Ptolemy, Kattigara can actually be located only in the Mekong delta, because Alexander went first along the east coast of the Malacca peninsula, northward to Bangkok, from thence likewise only along the coast toward the south east, and so came to Kattigara.
We hear nothing of any further change of course.
In addition, at Óc Eo, an emporium excavated in the western Mekong delta, in the ancient kingdom of Fu-nan, Roman finds from the 2nd century after Christ have come to light.
Óc Eo may have been the port known to the Romans as Cattigara. Cattigara was the name given by the 2nd-century Alexandrian geographer Claudius Ptolemy to the land on the easternmost shore of the Indian Sea at (due to a scribal error) 8½° south of the Equator.
The name "Cattigara" was probably derived from the Sanskrit Kirti-nagara कीर्ति- नगर "Renowned City" or Kotti-nagara कोटि-नगर "Strong City".
Scholarship has now determined that Ptolemy's Cattigara was at 8½° north of the Equator and was the forerunner of Saigon as the main port and entrepot at the mouth of the Mekong.
John Caverhill deduced in 1767 that Cattigara was the Mekong Delta port Banteaymeas (now Hà Tiên), not far from Óc Eo. The plea in 1979 by Jeremy H.C.S. Davidson for  "a thorough study of Hà-tiên in its historical context and in relation to Óc-eo" as indispensable for accurate understanding and interpretation of the site, still remains unanswered.
The eighteenth-century French geographer, Jean-Baptiste Bourguignon d'Anville, located Cattigara at the mouth of the Mekong (Cottiaris) River, where it is shown on his map, Orbis Veteribus Notus (The World Known to the Ancients).
The Swedish yachtsman and writer Bjorn Landström also concluded, from the sailing directions given by the ancient merchant and seafarer Alexander, that Cattigara lay at the mouth of the Mekong.
The "father of Early Southeast Asian History", George Coedès, has said: "By the middle of the 3rd century Fu-nan had already established relations with China and India, and it is doubtless on the west coast of the Gulf of Siam that the furthest point reached by Hellenistic navigators is to be found, that is the harbour of Kattigara mentioned by Ptolemy". A.H. Christie said in 1979 that "the presence of objects, however few in number, from the Roman Orient" added some weight to the conjecture that Óc-eo was the Ptolemaic Kattigara. The distinguished German classical scholar, Albrecht Dihle, supported this view, saying:
From the account of the voyage of Alexander referred to by Ptolemy, Kattigara can actually be located only in the Mekong delta, because Alexander went first along the east coast of the Malacca peninsula, northward to Bangkok, from thence likewise only along the coast toward the south east, and so came to Kattigara. We hear nothing of any further change of course. In addition, at Óc Eo, an emporium excavated in the western Mekong delta, in the ancient kingdom of Fu-nan, Roman finds from the 2nd century after Christ have come to light.
Óc Eo