Who are the devotees of Shiva?

The original devotees of Shiva were called Nayanars.

The Nayanmars were a group of 63 saints (also saint poets) in the 6th to 8th century who were devoted to the Hindu god Shiva in Tamil Nadu. 

They, along with the Alwars, their contemporaries who were devoted to Vishnu, influenced the Bhakti movement in Tamil. 

The names of the Nayanars were first compiled by Sundarar. The list was expanded by Nambiyandar Nambi during his compilation of material by the poets for the Tirumurai collection, and would include Sundarar himself and Sundarar's parents.

Sundarar's original list of Nayanars did not follow any sequence with regards to chronology or importance. However, some groups have since followed an order for arranging their Nayanar temple images according to Sundarar's poem as well as the information from Nambi and Sekkizhar.

List of 63 Nayanars

No.[7]	Person	Notes
1	Sundarar	Born In Aadhi month, Swathi Nakshathiram	2	Tiru Neelakanta
3	Iyarpagaiar
4	Ilayankudi Maranar
5	Meiporul
6	Viralminda
7	Amaraneedi
8	Eripatha
9	Yenathinathar
10	Kannappa	Mutharaiyar
11	Kungiliya Kalaya
12	Manakanchara
13	Arivattaya
14	Anaya
15	Murthiyar
16	Muruga
17	Rudra Pasupathi
18	Nandanar (Thirunalai Povar)	He is the only Dalit ("Scheduled Caste") saint in the Nayanars
19	Tiru Kurippu Thonda
20	Chandeshvara
21	Appar (Tirunavukkarasar)
22	Kulachirai
23	Perumizhalai Kurumba	Kurumbar
24	Karaikkal Ammeiyar	woman saint who lived in the 6th century[8]
25	Apputhi Adigal
26	Tiruneelanakka
27	Nami Nandi Adigal
28	Sambandar
29	Eyarkon Kalikama
30	Tirumular
31	Dandi Adigal
32	Murkha
33	Somasi Mara
34	Sakkiya
35	Sirappuli
36	Siruthondar	Army general of the Pallava king Narasimavarman I
37	Cheraman Perumal	Modern historians identified Cheraman Perumal Nayanar as the Chera ruler Rama Rajasekhara (c. 800—844 CE). He is the first known ruler of the Cheras of Makotai (c. 800—1124 CE)[9] Born In Aadhi month, Swathi Nakshathiram	38	Gananatha
39	Kootruva
40	Pugal Chola	Mutharaiyar king
41	Narasinga Muniyaraiyar	Mutharaiyar
42	Adipaththar
43	Kalikamba
44	Kalia	Born In Aadhi month, Kettai Nakshathiram
45	Satti
46	Aiyadigal Kadavarkon
47	Kanampulla
48	Kari
49	Ninra Seer Nedumaara	Pandya king
50	Mangayarkkarasiyar	Queen and consort of king Ninra Seer Nedumaaran
51	Vayilar
52	Munaiyaduvar
53	Kazharsinga
54	Idangazhi
55	Seruthunai
56	Pugazh Thunai
57	Kotpuli	Born In Aadhi month, Kettai Nakshathiram
58	Pusalar
59	Nesa
60	Sengenar (Kochengat Chola)
61	Tiru Nilakanta Yazhpanar
62	Sadaiya	Sundarar's father
63	Isaignaniyaar	Sundarar's Mother