Ponniyin Selvan Varalaatru Peravai

The myth of Cheraman Perumal's conversion. some matter from the net

Recently, The President of India, Dr. A P J Abdul Kalam visited the
Cheraman Juma Musjid in Kodungallur (ancient Muziris) in Kerala. This
mosque, believed to have been built by Malik bin Dinar in 629 AD, is
considered to be the oldest mosque in India.
As the tradition goes, a Chera king, Cheramanperumal of Kodungallure,
left for Makkah, embraced Islam, and accepted the name Thajudeen. He
married the sister of then King of Jeddah. On his return trip,
accompanied by many Islamic religious leaders, led by Malik-ibn-Dinar
(RA), he fell sick and passed away. But he had given introductory
letters for the team to proceed to `Musiris' (Kodungallur, the Chera
capital. The visitors came to Musiris and handed over the latter to
the reigning king, who treated the guests with all respect and
extended facilities to establish their faith in the land. The king
also organised help for the artisans to build the first Mosque at
Kodungallur, by converting Arathali temple into a Juma-Masjid.

This story seems to be a myth propagated in the book Keralolpathi
(The origin of Kerala) and repeated many times over. None of the
reputed history books[1] mention this story, even the ones by eminent
historians[3]. According to Sreedhara Menon[9]
The Cheraman legend is not corroborated by any contemporary record or
evidence. None of the early or medieval travelers who visited Kerala
has referred to it in their records. Thus Sulaiman, Al Biruni,
Benjamin of Tuleda, Al Kazwini, Marco Polo, Friar Odoric, Friar
Jordanus, Ibn Babuta, Abdur Razzak, Nicolo-Conti – none of these
travelers speaks of the story of the Cheraman's alleged conversion to
Islam.
A mention of the Cheraman Perumal legend appeared in the 16th century
book Tuhafat-ul Mujahidin by Shaik Zainuddin, but he too did not
believe in its historical authenticity. But later cut and paste
historians seem to have forgot to add his disclaimer.