The building houses a treasure trove of artefacts

The rings, brooches and necklaces were part of Rhayader's Dolmynach House collection, left to the authority by Leila Williams after her death in 1994.

The jewellery had been stored in a council strong room for safe-keeping, but in 2004 it was reported missing.

The police and the council concluded that the items had been misplaced.

The building houses a treasure trove of artefacts dating back to the early 1890s when it was built by Miss Williams' grandfather, Rhys Edward Lewis.

The latest investigation into some of its missing contents was initiated by former council chair Margaret Morris, who complained to chief executive Mark Kerr.

Care

A council spokesman said: "We can confirm that Councillor Morris has made a formal complaint to the chief executive regarding Dolmynach House and the missing jewellery. That complaint is being investigated."

In Miss Williams' will it was stated that she wanted the terraced house, which stands near Rhayader town centre, to be preserved as an example of a period home.

The future of Dolmynach House is still under discussion and a group has been set up to care for the property.