By far the most notable has been the Dodd-Frank Act in the United States which, among other things, aims to induce greater transparency with regard to the board and the top management positions and their compensation.
While regulation has a role to play in ensuring robust corporate standards in banks, the point to recognize is that effective regulation is a necessary, but not a sufficient condition for good corporate governance. Regulation can establish principles and lay down rules but the motivation to implement these principles and rules in their true spirit is a matter of organizational culture.