A few more archelogical evidence from Pattnam.
Pot with the Jain inscription.
A large number of glass beads and semi-precious stones were found at Pattanam. A huge collection of beads made of glass and semi-precious stones, waste material from bead manufacturing, fragments of Roman glass bowls (first century B.C./A.D.), terracotta lamps (tentatively dated from B.C. 100 to A.D. 100), iron objects including knives and nails, and hooks and slags (with those made locally having a higher carbon content than the Roman ones), copper objects, including square or circular Chera coins (obtained for the first time in Kerala, from a stratographic context), gold ornaments (right from the Early Historic Period), sherds of coarse ware with Tamil Brahmi letters and graffiti on them (some found this season have pre-firing marks) and modern-day blue-and-white Chinese ceramics have also been found.
An amphora jar, the one below is from the Catalan region in Spain, shown here as an illustration. Excavations at Pattanam have yielded amphora sherds from the Mediterranean littoral including the Catalan area. Significantly, the largest collection of fragments of such Mediterranean amphorae excavated outside the boundaries of the ancient Roman Empire is now from Pattanam.
Terra Sigillata, yet another imported Roman ceramic, a piece of high-quality, stamped tableware discovered at Pattanam. Ceramics like this were earlier discovered at Arikamedu.
There is now evidence of a multi-cultural, urban and maritime society that existed there for at least 3,000 years or more, even before it became an Indo-Roman trade port. Pattanam has yielded the first and only extensive real evidence of the Indian Ocean trade contacts during the Early Historic (B.C. 300 – A.D. 500) and Early Medieval (A.D. 500-1000) periods from the Malabar coast.
Below image is of Cameo Blank, A kind of locally made jewellery known to have been popular in ancient Rome, again found in Pattanam.
There is no evidence of such mixing. Just because we traded, it does not mean they arabs settled here. The jews did and they did not marry outside their community for most parts. From where did you get the ceylon part ?