Cecily Neville, Duchess of York visited Sandwich, possibly trying to reconcile the parties. When the rebellion failed the first time, she invited Edward and George to London to reconcile them. Peace did not last long, and in the forthcoming war, she still tried to make peace between her sons. Edward IV was briefly overthrown by Warwick and Margaret of Anjou, and for about six months (October 1470 – April 1471), Henry VI was restored to the throne. The breach between Edward and his brother George was apparently never really healed; indeed, George was executed for treason in the Tower of London on 18 February 1478.
IEEE 1471 of software-intensive systems". It has long been recognized that "architecture" has a strong influence over the life cycle of a system. However, until relatively recently, hardware issues have tended to dominate architectural thinking, and software aspects, when considered at all, were often the first to be compromised under the pressures of development. IEEE 1471 was created to provide a basis for thinking about the architecture of software-intensive systems. IEEE 1471's contributions can be summarised as follows (in this list, items in "italics" are terms defined by and used in the standard): IEEE 1471 provides informative annexes that relate its concepts