Late 15th century alabaster figure of the Seated Madonna, Sedes Sapientiae – estimate €60,000-80,000 at Tiberius on June 21.

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The company, run by two experienced local dealers, held its auction premiere in March.

One of the stars of the collection offered on June 21 is a late 15th century, 14in (35cm) high alabaster figure of the Seated Madonna, Sedes Sapientiae (Throne of Wisdom).

The figure, which shows traces of polychromy, is attributed to the sculptor Gil de Siloé and workshop. He was born either in Orleans or Antwerp, c.1440, but his claim to fame are the works of art he created for the cathedral of Burgos in northern Spain at the behest of Queen Isabella of Portugal.

Furthermore, he was commissioned in the late 1480s by Isabella of Castile, the queen’s daughter, to design a magnificent, star-shaped alabaster tomb for her parents. Her father King Juan II of Castile had died in 1454; her mother survived until 1496.

The tomb – the carving of which shows many similarities to the Madonna on offer in Vienna for €60,000-80,000 – is housed in the Caruja de Miraflores, a Carthusian monastery just outside Burgos.