The capital of Jiaozhi was proposed by Ferdinand von Richthofen in 1877 to have been the port known to the geographer Ptolemy and the Romans as Kattigara, situated near modern Hanoi. Richthofen's view was widely accepted until archaeology at Óc Eo in the Mekong Delta suggested that site may have been its location. Kattigara seems to have been the main port of call for ships traveling to China from the West in the first few centuries AD, before being replaced by Guangdong.