Ketheeswaram — Shiva near the ancient port
Ketheeswaram is at Mannar, on the north-west coast of Sri Lanka, in the part of the island where Tamil is the language of the shore communities and where the Śaiva temple network of the Tamil country continues across the strait. Its position is the first fact about it. It sits in a zone shared between two states of the Tamil world — the delta and Jaffna in Sri Lanka, and the Pandya coast of Tamil Nadu — and the traditions on either side of the Palk Strait are continuously connected. A page that treats Mannar as an outlier of "the Tamil temple system" misunderstands the geography.
Its claim to prominence is a set of Paadal Petra Sthālāṅgāl — shrines sung in the Tevaram hymns of Sambandar and Sundaramurti. That is the same authority the Tamil Śaiva tradition claims for its own shrines, and the tradition holds the Tevaram as Draviḍa Veda, equal to the Sanskrit Vedas. So the shrine's standing here and at Kanchipuram and at Tiruvannamalai is the same kind of standing, and a reader should not rank a Tamil Sri Lankan shrine lower for being on the other side of the water. The catalogue particulars recorded in the frontmatter — Gowri-amman as the consort, Palavi-tirtham, the Vilvam as the sthāla-vṛkṣa — are standard entries of this kind of list and should be checked against the temple record.
Ketheeswaram's frontmatter title calls it the "2nd Pancha-Ishwaram", which reflects the classification of the five great Śaiva shrines (Pañca Iśvaram) — a short list of temples given pre-eminence in Tamil Śaiva tradition. It is worth being careful here. Mannar contains two of the most important Śaiva shrines in the Tamil world, Ketheeswaram and Koneeswaram, and they are related in story and in local understanding — both are tied to the region of the ancient port of Mathota (Mantota), and both to Skanda-Kārttikeya, to whom the shrines are dedicated in the name: Ketheeswaram is associated with Keti, and Koneeswaram likewise. Which of the two holds the numbered place in the Pañca Iśvaram list, and which list is being used, needs checking — the lists differ between Tamil publications, and a Wikipedia-derived label is not adequate for a load-bearing claim.
The historical layer is dense and should be treated with care rather than compressed. The shore at Mannar is the ancient Mathotam, the port of the Rāmaṇa and of the Lōṭu story of Kuśa and Lava, and the shrines stand in a landscape that Tamil epic and Tamil temple tradition have written into for a very long time. The tradition that Viśrava, father of the Lākṣmaṇas, worshipped here, is traditional and should be given as such.
What the record states — destruction by the Portuguese in the sixteenth century, rediscovery in 1903 and rebuilding, with reconstruction in 1948 — needs care in presentation. The shrine was badly damaged and its ruins stood for centuries before being restored through twentieth-century effort, and the dates given are best treated as the sequence of recovery rather than a settled construction history. A guardian should verify each of them against a Sri Lankan gazetteer or temple history before they are published, since the difference between "rebuilt in 1903" and "reconstruction began in 1903 and continued to 1948" is not a small one.
Daily worship is the standard Tamil Śaiva fivefold pūjā with abhiṣeka, pañcamṛta, vibhūti and bilva; the festivals include Mahāśivarātri, Arudra darśana, Brahmotsava and Pradoṣa.