The foundational history of Westpac is intertwined with the economic birth of modern Australia. In the early 19th century, the British penal colony of New South Wales suffered from acute currency chaos, trading in an erratic mixture of Spanish dollars, promissory notes, and rum barter. On April 8, 1817, Governor Lachlan Macquarie granted a charter of incorporation to 39 prominent citizens and merchants, including Edward Smith Hall and John Thomas Campbell, establishing the Bank of New South Wales. The bank opened for business on Mary Reibey's premises in Macquarie Place, issuing Australia's very first bank notes. As the Australian gold rush boomed in the 1850s, the bank expanded rapidly into Victoria and Queensland, financing frontier commerce and mining infrastructure. In 1861, it opened its first overseas branch in New Zealand. Over the twentieth century, the bank absorbed numerous regional financial institutions, including the Western Australian Bank in 1927 and the Australian Bank of Commerce in 1931. In 1982, the Bank of New South Wales executed a landmark merger with the Commercial Bank of Australia (established 1866) and officially rebranded as Westpac Banking Corporation—a portmanteau representing its focus on the 'Western Pacific'. In December 2008, amid the global financial crisis, Westpac completed the transformative A$19 billion acquisition of St.George Bank, solidifying its position as Australia's second-largest residential mortgage lender and assembling its powerful multi-brand portfolio.