Saint Kilian
Count Gebhard of the Niederlahngau (832–879) was the first known lord of that holding around Seck in the Middle Westerwald, from which he split the western part to endow his monastery at Gemünden. Count Gebhard's grandson, Rudolf I, Bishop of Würzburg (892–908) consecrated a church at Seck to Saint Kilian. Seck had its first documentary mention on 27 May 1059 by King Heinrich IV. In the time that followed, Seck acquired a court. Its great parish reached through Rennerod and Lasterbach all the way to Oberrod. Arnold I of Vaucourt, Archbishop of Trier documented in 1181 that the Seligenstatt Monastery in Seck had been donated to the Archmonastery of Trier ("Erzstift Trier"). In 1215 it was the Maria Laach Abbey's daughter monastery. In the mid 15th century, an end was put to monastery life. In 1468, excise from the Seck yearly market was raised. The Lords of Westerburg and Runkel held sway over the parish of Seck. Often, it was the object of disputes between these two houses and their sidelines. Prince Moritz Heinrich of Nassau-Hadamar had the "Secker Weiher" (pond) built in 1672, and shortly thereafter also the "Schlösschen" (little residential castle) at Seck, still known locally as the "Alte Burg" (“Old Castle”). Along with the Principality of Nassau-Hadamar, Seck passed to the Grand Duchy of Berg in 1806 and later to the Duchy of Nassau. Administratively, Seck went to the "Amt" of Rennerod. In 1866, Duke Adolf of Nassau lost his land to Prussia. The administrative offices were dissolved, “Stein” self-administration introduced, and "Landkreise" (rural districts) formed. Seck ended up in the Oberwesterwaldkreis, whose seat was in Marienberg, and then in 1855 in the newly formed Kreis Westerburg, which itself was merged in 1932 into a new Oberwesterwaldkreis with its seat in Westerburg. In 1974, Seck became part of the "Verbandsgemeinde" of Rennerod, but as an autonomous "Ortsgemeinde". The two Westerwald districts (Oberwesterwaldkreis and Unterwesterwaldkreis) were dissolved and merged into the Westerwaldkreis with its seat in Montabaur.