Lalla

Lalla (c. 720–790 CE) was an Indian mathematician, astronomer, and astrologer who belonged to a family of astronomers. His most famous work was titled Śiṣya-dhī-vṛddhida-tantra, or "Treatise which expands the intellect of students." He is also known for having published the earliest known description of a perpetuum mobile in Śiṣyadhīvṛddhidatantra.