There is no evidence for the earliest dates of local history. The place "Bischofesgrune" is mentioned in a document of the Bamberg Bishop Otto from the year 1242, but in this year Bishop Heinrich I reigned in Bamberg. A bishop Otto is not documented for this time.[5] A parish church is said to have existed on the site of the present church as early as 1204, indicating a larger settlement, but there is only one reference to this from a 19th-century evangelical pastor.[6] According to old traditions, which are not historically documented, a glassworks is said to have been here around 900. The first reliable findings are from the year 1317, when the Counts of Hirschberg received the Rudolfstein together with the surrounding villages (including Bischofsgrün) as a fief from Emperor Ludwig the Bavarian. In 1340 a "glass making" was mentioned for the first time.[7] In 1360 the rule of the Lords of Hirschberg passed to the Burgraves of Nuremberg, who later became Margraves of Brandenburg-Bayreuth. For 1421 the tin mining at Ochsenkopf is mentioned by Italian experts; reported for 1536 from a glassworks. The town had 39 houses at that time. In 1616, members of the Greiner family of glassmakers bought up the burned down glassworks and brought it back to prosperity. In 1473 Bischofsgrün came to the Margraves of Brandenburg-Kulmbach. The existence of a first church is documented in 1496, the Catherine Chapel, which was probably built in the 11th century. From 1500 Bischofsgrün was in the Franconian imperial circle. Due to its remote location, Bischofsgrün was spared the Hussite Wars of 1419-1434, the Peasants' Wars of 1525 and the religious wars of 1552-1555.
Source: Wikipedia