The Laranian religion has been present in western Hârn for at least five hundred years, and its development has been as complex as the politics with which it has been intimately tied. It is not possible to examine the emergence of, and changes to, the bishoprics of the region without paying some attention to wider events: for example, the rise and fall of the Corani Empire, the unification of Kand, and the Theocracy of Tekhos.
Aleathia is the oldest diocese in western Hârn; its origins date back into the ninth century SA.
Ternula was officially created in 1302. However, as with the Bishopric of Perinore, the matter of creating a new bishopric to meet the spiritual and administrative needs of the region was first broached to the Serekela of the Western Kingdoms in the middle of the thirteenth century - a period in which the upheavals caused by the dissolution of the Theocracy of Tekhos were being replaced by the burgeoning prosperity and order of the kingdoms that arose in its wake.
Unlike the situation with Perinore Diocese, however, there was no de facto existence to speed the bureaucractic process along. The proposition, once taken up by the Serekela (it is not known who first approached him on the matter, though doubtless the move was backed by the King of Gemela at the time), was passed on to the Lirrath of Hârn, who in turn brought it to the attention of the Sebrath and Tirnatha at Tengela.
The process, which had never been marked as of particular importance, was hastened considerably when Ranald Milaka, husband of Queen Mirelael, prompted the Serekela in 1294 to request that all lengths be taken to ensure the speedy execution of the decades-old proposal. With so much of the necessary work done and requiring only final adjustment and ratification, the word came from Tengela in 1302 that the new diocese, to be called Ternula, is recognised and accepted as the will of the Goddess in the eyes of the Tirnatha and Sebrath.