Claim: Hadji Samanhudi (who studied Islam in Surabaya) was the founder of Sarekat Dagang Islam in 1911 who began trading in batik.
Evidence: Hadji Samanhudi (1868 – 28 December 1956) was the founder of Sarekat Dagang Islam, an organization in Indonesia that previously served as an association for batik traders in Surakarta, and later broadened its scope to nationalist political issues. He then studied Islam in Surabaya. At the same time he began trading in batik. Samanhudi founded Sarekat Dagang Islam, or Islamic Trade Union, in 1911.