Zhang Ruitu ( 1570 - 1641 ) was a Chinese Ming Dynasty calligrapher, painter and poet, known for scroll paintings of landscapes. Zhang Ruitu s works have been put up for auction numerous times, with realized prices greatly surpassing estimated prices, varying from 27451.58 USD for Calligraphy in Cursive Script in 2006 to a remarkable record 11359054.57 USD for Sutra in Cursive Script Calligraphy