[5] Knebworth's most famous resident was Edward Bulwer-Lytton (1803–1873), the Victorian author, dramatist and statesman, who embellished the gardens in a formal Italianate fashion.
The 1st Baron's great-grandson Neville (1879–1951) married Judith Blunt, a well known horse breeder who inherited Crabbet Arabian Stud in 1917 and devoted her life to it.
In 1913–1914 the house was leased for £3,000 per year by Grand Duke Michael Alexandrovich of Russia and his morganatic wife Natalia Brasova.
[6] Much of the interior of Knebworth House was redesigned by Sir Edwin Lutyens, who married Lady Emily Bulwer-Lytton (1874–1964) – he simplified the main parterre.
Over the years the festival has featured major artists such as Pink Floyd, The Rolling Stones, Led Zeppelin, Lynyrd Skynyrd, Queen (their 1986 concert at the venue their last with Freddie Mercury), Paul McCartney, Genesis, Mike Oldfield, The Beach Boys, Deep Purple, Eric Clapton, Elton John, Dire Straits, Robbie Williams, Oasis and Liam Gallagher.