query: What is the oldest bank in the world?
passage: List of oldest banks in continuous operation
Depending on the definition, the world's oldest bank is either Banca Monte dei Paschi di Siena or Berenberg Bank. Banca Monte dei Paschi di Siena was founded in its present form in 1624, but traces its history to a mount of piety founded in 1472. The Berenberg company was founded in 1590 and has operated continuously ever since with the same family as owners or major co-owners. Banca Monte dei Paschi di Siena is today a large Italian retail bank, while Berenberg Bank is primarily involved in investment banking and private banking for wealthy customers; in any event Berenberg Bank is the world's oldest merchant bank or investment bank. The world's oldest central bank is the Sveriges Riksbank, which was founded in 1668.
passage: History of Wells Fargo
In 1960, Hellman engineered the merger of Wells Fargo Bank with American Trust Company, a large northern California retail-banking system and the second oldest financial institution in California, to form the Wells Fargo Bank & American Trust Company. Ransom M. Cook was president with Hellman as chairman. The name was again shortened to Wells Fargo Bank in 1962.
In 1964, H. Stephen Chase was elected president with Cook as chairman. This merger of California's two oldest banks created the 11th largest banking institution in the United States. Following the merger, Wells Fargo's involvement in international banking greatly accelerated. The company opened a Tokyo representative office and, eventually, additional branch offices in Seoul, Hong Kong, and Nassau, Bahamas, as well as representative offices in Mexico City, São Paulo, Caracas, Buenos Aires, and Singapore.