Sir Ken Dodd’s widow has pledged £700,000 through the comic’s foundation to build a mini-amphitheatre.
The outdoor venue will form part of the Shakespeare North Playhouse project, due to open in Prescot in 2022.
The Merseyside town once had the only purpose-built Elizabethan theatre outside London, and it now hopes to form a new “Bard triangle” with London and Stratford-upon-Avon.
Lady Anne Dodd said Sir Ken would have been “thrilled to bits” to help.
The Ken Dodd Charitable Foundation initially put in £250,000 but will raise that amount to £700,000 to complete a so-called performance garden.
Lady Anne said: “Ken’s real love was the theatre and Liverpool, and he set up the foundation years ago.
“I’m now able to use the money and his legacy to fund a lot of wonderful projects, one of which is this Shakespeare North Playhouse theatre.
“Ken was approached a couple of years before he passed, and he was absolutely delighted to be able to help.”
Sir Ken, famous for his unique stand-up shows and trademark tickling sticks, died aged 90 in 2018.
Lady Anne said she would like to see famous quotations from Shakespeare on the steps of the amphitheatre – but interspersed with some of Sir Ken’s own quirky phrases.
The comic was known exclaim ‘How tickled I am’, ‘tattyfilarious’ and ‘plumptious’.
The planned £30m playhouse has been designed with more than 450 seats, based on the 17th century “cockpit-in-court” style.
“Ken just loved Shakespeare because of the words, he was such a wordsmith,” continued Lady Anne.
“Way back in 1971 Ken played Malvolio in Twelfth Night. Some people thought he might not stick to the script, but he was word-perfect from the first day. He got wonderful reviews.
“Ken would be really thrilled to bits. He would have loved it.”