Romanshorn is a municipality in the district of Arbon in the canton of Thurgau in Switzerland.

Romanshorn was probably settled in the 7th century, and is first mentioned in 779 as Rumanishorn in a land grant from Waldrata to the Abbey of St.

[3] During the Late Middle Ages and until 1367, the bailiwick of Romanshorn was partially owned by the Landsberg family.

In 1455 Abbot Kaspar Landsberg sold the Romanshorn estate to the city of St. Gallen, but his religious superiors forced the courts to repeal the sale.

[3] The local economy was dominated by cereal grains, horticulture and fruit growing as well as some forestry and fishing.

However, the village didn't begin to grow until 1844 when the Canton of Thurgau built a port and the postal route to Swabia ran through Romanshorn.

In 1855 the railway line Zurich-Romanshorn opened, and in 1856 a telegraph cable was laid across the lake.

The Fatzer company, founded in 1836, initially produced cords and ropes.

On 30 August 1912 an ex-soldier and local resident named Hermann Schwarz went on a shooting spree that left seven people dead and several others wounded.

After the shooting he was examined by several psychiatrists and was found to suffer from mental illness, resulting in his acquittal due to insanity.

It consists of the village of Romanshorn and the hamlets of Holzenstein, Hotterdingen, Reckholdern, Riedern and Spitz.

[7] The age distribution, as of 2009[update], in Romanshorn is; 837 children or 8.7% of the population are between 0 and 9 years old and 1,158 teenagers or 12.1% are between 10 and 19.

[13] The historical population is given in the following table:[3] The Old Paritätische Church, Harbor, Catholic Church of St Johannes der Täufer are listed as Swiss heritage site of national significance.

The entire village of Romanshorn is listed in the Inventory of Swiss Heritage Sites.

A car ferry connects Romanshorn with Friedrichshafen across the lake in Baden-Württemberg, Germany.

From the 2000 census[update], 3,220 or 35.5% are Roman Catholic, while 3,297 or 36.3% belong to the Swiss Reformed Church.

Of the children in kindergarten, 80 or 43.2% are female, 84 or 45.4% are not Swiss citizens and 86 or 46.5% do not speak German natively.

The lower and upper primary levels begin at about age 5-6 and lasts for 6 years.

At the lower primary level, there are 118 children or 43.4% of the total population who are female, 116 or 42.6% are not Swiss citizens and 117 or 43.0% do not speak German natively.

In the upper primary level, there are 146 or 53.3% who are female, 98 or 35.8% are not Swiss citizens and 102 or 37.2% do not speak German natively.

There are 181 teenagers who are in the advanced school, of which 108 or 59.7% are female, 29 or 16.0% are not Swiss citizens and 33 or 18.2% do not speak German natively.

There are 163 teenagers who are in the standard school, of which 74 or 45.4% are female, 70 or 42.9% are not Swiss citizens and 76 or 46.6% do not speak German natively.

Finally, there are 22 teenagers who are in special or remedial classes, of which 11 or 50.0% are female, 12 or 54.5% are not Swiss citizens and 16 or 72.7% do not speak German natively.