This was according to the notice a Roman "mezarlık"which would be a graveyard. I don't quite understand the meaning of this, was it a family grave, as Romans were want to erect? It has sunk considerably or rather, the city has - as city's do - risen.

This Roman mausoleum is dated from the 4th century AD. It was unearthed in 1956 and restored that same year.
It has the form of a house, with an entrance door in its north side. When it was discovered, several Islamic tombstones were found inside, bearing inscriptions and a date: 717 AH (1317-1318 AD); this could explain why it may be referred to as a ‘Mezarlık’ by some sources.

Correspondent: J.M.Criel, Antwerpen
Sources: ‘Kayseri Kültür Varlıkları Envanteri’ (Kayseri Belediyesi 2008)