In addition to the parish church at Llanilar, the church at Trefilan in Ceredigion near Lampeter is also dedicated to Saint Ilar or Hilary, the name of the community having been corrupted from an original Tref Ilar (lit.
 "Town of Ilar").
The Church in Wales also administers churches dedicated to Saint Hilary at Erbistock in Wrexham, Killay in Swansea, and the village of St Hilary near Cowbridge in the Vale of Glamorgan.
Rees and others considered all of the churches of "Saint Hilary" possible remnants of dedications to Ilar.
Despite a conflicting account in the Iolo Manuscripts and the Enwogion Cymru, Baring-Gould opined that the church at Cowbridge was certainly dedicated to the French saint.

The 15th-century poet Lewis Glyn Cothi mentions gwyl Ilar hael a'i loer hir ("the festival of generous Ilar with his long moon") in his work.

Saint Ilar, his holy well and legends, and his accidental replacement by the French bishop Hilary appear in Arthur Machen's 1907 short story "Levavi Oculos" and its reworked form as part of his 1922 novel The Secret Glory, about a schoolboy's encounter with the Holy Grail of Welsh and Arthurian legend.
In addition to the parish church at Llanilar, the church at Trefilan in Ceredigion near Lampeter is also dedicated to Saint Ilar or Hilary, the name of the community having been corrupted from an original Tref Ilar (lit. "Town of Ilar"). The Church in Wales also administers churches dedicated to Saint Hilary at Erbistock in Wrexham, Killay in Swansea, and the village of St Hilary near Cowbridge in the Vale of Glamorgan. Rees and others considered all of the churches of "Saint Hilary" possible remnants of dedications to Ilar. Despite a conflicting account in the Iolo Manuscripts and the Enwogion Cymru, Baring-Gould opined that the church at Cowbridge was certainly dedicated to the French saint.
The 15th-century poet Lewis Glyn Cothi mentions gwyl Ilar hael a'i loer hir ("the festival of generous Ilar with his long moon") in his work.
Saint Ilar, his holy well and legends, and his accidental replacement by the French bishop Hilary appear in Arthur Machen's 1907 short story "Levavi Oculos" and its reworked form as part of his 1922 novel The Secret Glory, about a schoolboy's encounter with the Holy Grail of Welsh and Arthurian legend.
Saint Ilar