6'1 x 8'10 Mohtashem Kashan Rugs – Antique Rugs By Mohtashem From Kashan – Ustadan Mohtashem is one of the most revered weavers of Kashan. His rugs are some of the highest quality Persian weavings. The town of Kashan located in central Iran between Isfahan and Tehran is often referred to as the greatest weaving center in western Persia.