The tag “am Glan” merely serves to distinguish the Henschtal Ortsteil from the self-administering Ortsgemeinde of Haschbach am Remigiusberg, which lies in the same district.

[7] Trahweiler was originally settled along the valley road, which can still be made out today in the simple farmhouses that were built mostly in the 19th century to the general design that characterizes such houses in the Westrich, an historic region that encompasses areas in both Germany and France.

[8] Even as far back as prehistoric times, the broader area around the village was settled by man, bearing witness to which are archaeological finds.

[10] From the contiguous Free Imperial Domain (Freies Reichsland) around Castle Lautern (Kaiserslautern), kings split certain areas off to give as donations to both ecclesiastical and secular lordships.

Werner furnished this monastery richly with estates and lands, among which was the Münchweiler Tal (dale), which itself included the Henschbach valley, to which Haschbach belonged.

As a fief from Hornbach Abbey with Glan-Münchweiler as its hub, all villages in this valley first passed to the Raugraves in the Nahegau, and thereafter to the Archbishop of Trier in 1344 and to the Breidenborns in 1338.

Thus it says in the Weistum of Glan-Münchweiler (a Weistum – cognate with English wisdom – was a legal pronouncement issued by men learned in law in the Middle Ages and early modern times), which was handed down about 1330 and written in both Latin and Middle High German, that the Raugraves’ representative (a bailiff or a beadle) was entitled to, among other things, a piece of land in Hagenspach.

In Latin, the text reads: "habet idem pedellus in Haschbach in inferiore mansu dimidietatem ex parte dominorum quidquid cedit."

The Middle High German text reads: "Item hat auch derselbig büttel von der herren zu Hagenspach im underen mansu den halben theil, was da felt."

Then, in the 1456 Glan-Münchweiler Weistum, it says: "Da soll ein apt zu Hornbach von sant Pirmans wegen denselben budel den zehenden zu Haspach zuschen den zwein grunden geben und zustellen nach wisung des orteils."

With Georg I's marriage to Eva von Mauchenheim in 1456, the House of Leyen came into ownership of the Bliesgau, and by inheritance in 1486 that family also came to own a share in the castle at Blieskastel.

At the same time, Abbot Ulrich of Hornbach Abbey granted Jörge von der Leyen, a Burgmann from Castle Lautern, the Münchweiler Tal.

After Count Franz Karl's death in 1775, his beloved, and now widowed, wife Marianne took on the regency for their underage son, Philip Francis, Prince of Leyen.

Newcomers raised the population figures back up, and beginning in the 18th century, there were once more people migrating out of the village.

[14] Countess Marianne von der Leyen managed to flee during the occupation of Blieskastel by French Revolutionary troops, escaping with subjects’ help first to Koblenz and then later to Frankfurt.

Haschbach belonged during the time of French rule to the Department of Sarre, the Mairie (“Mayoralty”) of Quirnbach, the Canton of Kusel and the Arrondissement of Birkenfeld.

In 1814, the French were driven out, and after a transitional period, the Baierischer Rheinkreis (Bavarian Rhine District) was founded, which was later called the Rheinpfalz (Rhenish Palatinate).

As can still be seen today in the building style of the village's houses, the greater part of the population in the 19th century earned their living at agriculture.

Thus, agriculture today plays a subordinate role, and the village is first and foremost a residential community for people in the most varied of occupations.

The following table shows population development over the centuries for Haschbach am Glan, with some figures broken down by religious denomination:[18] The following table shows population development over the centuries for Trahweiler, with some figures broken down by religious denomination:[19] Haschbach is among the many villages with names ending in —bach (“brook”) that arose at streams at the time when the Franks were taking over the land.

The first syllable, Hasch—, or, to use its older form, Has—, according to placename researchers Ernst Christmann and Kaufmann, refers to the hare (in German, Hase; or in Proto-Germanic, Haso).

Researchers Dolch and Greule concur, but do not rule out that the syllable might refer to Hasa, a name for a body of water.

The first syllable, Hensch—, derives from the German Hengst (“stallion”; compare the development of the English word henchman[23]), and indeed for a while, the brook was called the Hengstbach.

The arms go back to a design by Willi Nierhaus, and have been borne since 1972 when they were approved by the now defunct Rheinhessen-Pfalz Regierungsbezirk administration in Neustadt an der Weinstraße.

[28] The following are listed buildings or sites in Rhineland-Palatinate’s Directory of Cultural Monuments:[29] Both Ortsteile together hold their kermis (church consecration festival) on the second weekend in October.

[36] Besides farmers, craftsmen lived in the village, and beginning in the early 20th century, also miners, factory workers, company employees and officials.

Only after the cession to the Kingdom of Bavaria after the Congress of Vienna did the government put forth efforts, right from the beginning, to build a school for both the villages on each side of the Henschbach.

When the government in Speyer nonetheless tried to force the formation of such a body in 1829, Trahweiler once more raised an objection, saying that it wished to build its own schoolhouse.

Once again, the government would not allow it and wrote: “The municipality of Trahweiler is much too small to build its own schoolhouse and remunerate its own schoolteacher.” The Landkommissariat of Kusel took the same view and in 1832 announced: “The municipality of Trahweiler has at last stepped back from its intention to build its own schoolhouse.” Although a school cooperative was now established, there were once more differences of opinion, this time about who would pay how much in fees for the school.

[38] Preparations to build a school in the early 17th century could not be brought to fruition mainly because of the frightful events of the Thirty Years' War, and newer records about schooling in Trahweiler only show up in historical records from the 18th century (the Thirty Years' War ended in 1648).