The place was probably founded in the 12th or 13th century by the Order of the German Knights . The first written mention comes from the year 1344 and speaks of Virius Bleystofer comandator in plates. At this time the first craftsmen settled in the area around the castle. At the beginning of the 15th century there were disputes with the order. This was heavily in debt and also refused to obey the Bohemian king. In order to compensate for the duties owed to the crown, plates were confiscated by Wenceslaus IV in 1404 and given to the Brux burgrave Hynek von Kauffung . During the Hussite Wars , Wilhelm Zajíc von Hasenburg was the owner of the castle. In 1587 Blatno was sold to Bohuslav Joachim von Lobkowicz, the owner of Rothenhaus . It remained in the property of the von Lobkowicz family until 1594. The last Lobkowicz Georg Popel von Lobkowicz was a fanatical supporter of Catholicism and established the faith in his own lands. In 1605 ownership passed to Adam Herzan von Harras . During the Thirty Years War , Platten was razed to the ground by Count General Fabian von Wrangel . The rest of the population died of plague and starvation. Five years later the partially rebuilt village was destroyed by the Swedes .
In 1654 the village stood again and after the berní rula there were 5 cattle breeders, 18 cottagers and 1 innkeeper. After an interim rule by the Liechtensteiners, the entrepreneurial feudal Alexander Rottenhan bought the rule in 1771. The first school was opened in 1776, and in 1782 the foundation stone for the construction of the Michaeliskirche was laid. The population lived mainly from agriculture. Wood processing and a cheese dairy were added later. From the middle of the 19th century, the village formed a municipality in the judicial district of Görkau or in the district of Komotau .
In 1945 the German population was brought to Laun and expelled to Germany in 1946 .