kavachams.

Suryanar koil for the sun god, Indalur temple for the moon god, Vaidheeswaran koil for mars, Thiruvankadu for Budha, Alangudi for guru, Thiruvellangudi for sukra, Thiru nallar for Saturn, Sri Vanchiyam for Rahu and Kethu.

sukra stands for silver thus velliangudi this place existed in all the four yugas, it is known varingly as Brahmapuram, Parasara kshetram, Indrupuram, Bhargavapuram.

The Kavacham told by Lord Siva to Markandeya rushi.

Keshava please guard my head;
Narayana please guard my hair;
Madhava please guard my forehead;
Govinda please guard my eyes;
Vishnu, Madhusudana please guard my Nostrills and the ears;
Thrivikrama please guard my neck;
Vamana and Sidhara please guard my two lips;
Hrishikesa please guard my teeth;
Padmanabha please guard my tongue;
Damodara please guard my two shoulders;
Sankarshana please guard my chest;
Vasudeva please guard my stomach;
Pradyumna please guard my back;
Anirudha please guard the two sides;
Purushotama please guard my waist;
Narasimha please guard the two thighs;
Achuta please guard my two knees;
Janardhana please guard the ankles;
Upendra please guard my feet;
Hari please guard the toes;
Krishna please guard the entire body;

thus Markandeya got his logavity.