Looking for: Birth date of Willem Muller (ca. 1795, Dromersheim)

My ancestor Johannes Mulder was born 10 June 1827, Leiden. His mother was Elisabeth van den Bosch, unwed, and the father was Willem Mulder, who recognized the child as his.

30 July 1827, Willem Mulder or Muller (that's how it's on the death certificate) dies in the military infirmary in Leiden. He's 32 years old, and said to have been born in Dromersheim. His parents are named as Stephanus Muller and Elisabeth Helser. There is no Dromersheim in the Netherlands and the name Muller is German, so Willem was most likely born in Dromersheim, Rheinland-Pfalz, Germany (unless there's another Dromersheim in Germany).

I am looking for his exact birth date, as well as information on when he came to the Netherlands. Any help would be appreciated.