Thirumukom meaning respected or sacred face, was a form of address used by common people while referring to their king in Kerala state, South India

South India

South India is the area encompassing India's states of Andhra Pradesh, Karnataka, Kerala and Tamil Nadu as well as the union territories of Lakshadweep and Pondicherry, occupying 19.31% of India's area...

. The term was also used in the ritual of Thirumukom Pidikukka, which was the main part of the ceremony of bestowing the title of Pillai

Pillai (Nair title)

Pillai is a title among the Nair community of Kerala. There is also a caste called Vellalar or Pillai in Tamil Nadu, which is different from the Nair community....

 on the Nair

Nair

Nair , also known as Nayar , refers to "not a unitary group but a named category of castes", which historically embody several castes and many subdivisions, not all of whom bore the Nair title. These people historically live in the present-day Indian state of Kerala...

s of Travancore

Travancore

Kingdom of Travancore was a former Hindu feudal kingdom and Indian Princely State with its capital at Padmanabhapuram or Trivandrum ruled by the Travancore Royal Family. The Kingdom of Travancore comprised most of modern day southern Kerala, Kanyakumari district, and the southernmost parts of...

. Similar forms of address for the Thampuran or king were Thirupad, Thiruvadi etc.