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A number of paintings by one of Wales' defining artists of the 20th century will go under the hammer this week.

Oil paintings, watercolours and prints by the late Sir Kyffin Williams are included in The Chester Sale at Bonhams, which runs this week across 5-7 July with the sale of the paintings scheduled for Wednesday.

Two oil paintings by Williams are up for auction: Snow at Gwastadnant is estimated at £20,000-£30,000 and the other, Snowdonia, is estimated to fetch £10,000-£15,000. Both show examples of the dramatic north Wales landscape for which the artist is most well-known and admired.

A watercolour showing Llyn Dinas, a mountain lake near Beddgelert in Gwynedd, is expected to fetch £900-£1,200, while a pencil and watercolour entitled Welsh Ponies on a Hillside is estimated at £2,000-£3,000.

Snowdonia by Sir Kyffin Williams. Image Copyright © 2002-2011 Bonhams 1793 Ltd.

Llyn Dinas watercolour by Sir Kyffin Williams. Image copyright © 2002-2011 Bonhams 1793 Ltd.

A series of unframed linocut prints called the 'Kyffin Portfolio' will also be sold and is expected to reach up to £2,000. The prints are entitled Venice, Rhosgadfan, The Farmer, his dog and his cottage, Welsh Blacks, The villages of Carmel and Cesarea, and Hunting the Fox.

Hunting the Fox print by Sir Kyffin Williams. Image copyright © 2002-2011 Bonhams 1793 Ltd.

Other works will be auctioned by Bonhams this week by Welsh artists or those associated with Wales, among them pieces by Josef Herman, Karel Lek, David Lloyd Griffith, Gwilym Pritchard and his wife and fellow artist Claudia Williams, Iwan Bala and Malcolm Edwards.