London AP  —  A set of the first four editions of William Shakespeare’s collected works is expected to sell for up to £4.5 million ($6 million) at auction next month. Sotheby’s auction house announced the sale on Wednesday, Shakespeare’s 461st birthday. It said the May 23 sale will be the first time since 1989 that a set of the First, Second, Third and Fourth Folios has been offered at auction as a single lot. The auction house estimated the sale price at between £3.5 million and £4.5 million.