RSamy

Tiruchirappalli (Tamil : தி௫ச்சிராப்பள்ளி) pronunciation (help·info) also spelled Tiruchirapalli, commonly known as Tiruchi or Trichy (Tamil : தி௫ச்சி) formerly also pronounced as Trichinopoly (under British rule) is the Fifth largest city of the Indian state of Tamil Nadu (after Vellore, Chennai, Coimbatore and Madurai) and is also one of the A1 metropolitan cities of Tamilnadu. It is situated in the centre of the state, on the banks of the Cauvery River. Trichy is a corporation and the administrative headquarters of Tiruchirapalli District.
Trichy encompasses Srirangam, a Vaishnavite temple and the biggest functioning Hindu temple in the world. Trichy also contains "ThiruAnaikka" (ThiruvAnaikkaval), one of the five main abodes ("Panchaboodha Sthalam") of Lord Shiva. ThiruvAnaikkaval is the House of Water. Chandrasekhara Venkata Raman was born in Thiruvanaikaval and his house has been preserved as a museum.
Tiruchirapalli city was named after a three-headed demon "Trishira" called "Chira"(the son of Ravana) who performed penance at the Siva temple here and obtained favors. The legend is that Shiva was worshipped by the demon ruler Tirisiran, hence Tiruchirappalli, Tirisirapuram etc . Also, since the three peaks here are occupied by Shiva, Parvati and Vinayaka, the name Tri-Shikharam or Tirisirapuram arose. The legend says that Shiva in the guise of a woman attended to the call of a devotee in labor, hence he is called as Matrubhuteswarar . [1]
There is another belief about the origins of the name Trichy. According to this version the name started out as Thiru Javvandhipuram (Place of Marigold Flowers): javvandhi, the Tamil name for the marigold flower which still grows in abundance in and around this region, and puram which means a dwelling-place -- so over time this became