Penang Never Belonged to Thailand

No. Penang has never been part of Thailand (Siam).

Historical Timeline

• 1786: British East India Company (Francis Light) leases Penang Island from Sultan of Kedah.
• 1800: Cession of Province Wellesley (Seberang Perai) mainland.
• 1826: Penang becomes part of Straits Settlements (British).
• 1948: Joins Federation of Malaya.
• 1963: Part of Malaysia.

Thailand's southernmost historical influence ended at the Kedah/Perlis border; Penang remained under Kedah then British sovereignty throughout.