Based on the above information, it transpires that Tamil Grammar includes Sanskrit Grammar and is an improvement on Sanskrit Grammar.
So I gave up trying to find out which is older, Tamil or Sanskrit, with the conviction that both go back to very vast stretches of Time, both quote each other.
Though marriage is considered to be sacred in Hinduism and has elaborate Rituals to solemnize and conduct marriages, I have not been able to find any definite information on who organized this system of marriage.
I could not find the origin of marriage details from the Puranas, Vedas or Ithihasas.
All these texts glorify and explain the rituals connected with Marriage.
The first written record on who organized marriage as a System is found in the ancient Tamil Grammar Book, Tholkappiyam, written by Tholkappiar, a disciple of Sage Agasthya.