Sachal Sarmast (17391829) (Sindhi: سچلُ سرمستُ, Urdu: سچل سرمست) was a Sufi poet from Sindh, Pakistan during the Kalhora era. Abdul Wahab was his real name and "Sachal" was the name he used in his own poetry. Sachalu means truthful in Sindhi. Sarmast means mystic in Sindhi and Urdu. Sachal Sarmast literally means 'truthful mystic'.
He is regarded as 'shair-e-haft zaban' (poet of seven languages) due to his poetical works in Arabic, Sindhi, Saraiki, Punjabi, Urdu, Persian and Balochi to address the wider audience in these languages. He spread the message of love for humanity through his poetry.
His poetical works are sung by local singers in Sindhi and Saraiki. His shrine is in village Daraza, Khairpur District, Pakistan.
(Source: Wikipedia)