Cosimo 'il Vecchio' de' Medici, 1389-1464 : essays in commemoration of the 600th anniversary of Cosimo de' Medici's birth : including papers delivered at the Society for Renaissance Studies Sexcentenary Symposium at the Warburg Institute, London, 19 May 1989 / edited by Francis Ames-Lewis ; with an introduction by E.H. Gombrich