Alsenz is a small town in the Donnersbergkreis between Kaiserslautern and Bad Kreuznach.

From 1650 individual Jews settled in the village. In the middle of the 19th century, the community reached a strength of one hundred people. Due to rural exodus and moving to the cities, the number of Jews constantly decreased. At the time of National Socialism, only individual residents were left in the village.

In the village there was a synagogue with mikvah and school, in front of the village there was a cemetery.

At the end of the 17th century, the still few Rockenhausen Jews attended the synagogue in Alsenz. In the course of the 18th century, a prayer room may have been established in Rockenhausen. In 1811 Manasse Kahnweiler set up a prayer room on the upper floor of an outbuilding of his house at Luitpoldstr. 20 (formerly building No. 250 in the "Grad Gaß"), which was solemnly inaugurated.  In the 1860s the desire to build a synagogue in Rockenhausen arose. The first plans were drawn up in 1867/68 by the district building officer Rosenthal.

Last use: vacant