This trade treaty was signed on 30 July 1818 during the reign of Almarhum Sultan Abdul Malik Mansur Shah.
“Treaty of the Commercial Alliance between the Honourable English East India Company, and His Majesty The Rajah of Perak, settled by Mr. Walter Sewell Cracroft, in virtue of powers delegated to him by the Honourable John Alexander Bannermann, Governor of Prince of Wales Island, and its dependencies. Done on the 27th Ramadhan, 1233 (answering to the evening of 30th July 1818)…”
To read more about the treaty, it is downloadable in PDF format. Click here.
At that time, Perak was being threatened by Siam by way of the powers in Kedah. Almarhum Sultan Abdul Malik Mansur Shah had further requested aid from the English East India Company but none was provided.
 Walter Sewell Cracroft was later the Resident-Councillor of The Straits Settlements in Malacca in 1825.
 The Honourable John Alexander Bannerman was Governor of Prince of Wales Isle and Province Wellesley (Seberang Perai) from 1818-1819.
 Penang at that time was known as the Prince of Wales Island.
Source: Newbold TJ. Political And Statistical Account Of The British Settlements In The Straits of Malacca, Viz Pinang, Malacca And Singapore With A History of The Malayan States on The Peninsula of Malacca, Vol 1. Albermale Street, London: John Murray; 1839.