Poptaslot or Heringastate is a stins—a type of luxurious house often used by and/or built for the nobility of Frisia,[1] many of which are built to look like castles (the term literally means "stone-house"[1])—in the Dutch province of Friesland (Fryslân).

[4] It was probably named Heringastate when it was founded, using his mother’s surname Heringa.

[3] Its last inhabitant, Doctor Henricus Popta, declared that his house should never be lived in again[5] and should be preserved.

Today slot guardians (Dutch: slotvoogden), of which four are currently active, still preserve the stins.

[5] It is located in the village of Marsum, near the provincial capital of Friesland, Leeuwarden, and is listed as rijksmonument number 28623.