St Austell Brewery will be launching a new 3.8% ABV beer, called Trelawny, following a reassessment of its portfolio.
Jeremy Mitchell, marketing and communications director at St Austell, said: "Last year we carried out a big review of our cask-ale range and put in place a rationalisation of our beer range for this year.
"We noticed that, although we've been doing really well with our bottled beers and our higher-end strength beers, there was a bit of a gap on the lower-ABV side."
The ale, named after Bishop Trelawny, who was locked up in the Tower of London and is featured in the Cornish national anthem, will feature a pump-clip sporting the Cornish colours of black and gold.
Trelawny will use Galaxy hops from Launceston, in Tasmania, and will be the only beer brand in the UK using them.
"They come from Launceston, which is the name of a town in Cornwall as well as Tasmania. We can say Trelawny is out of this world and play on the pun of Galaxy,"
said Mitchell.
Trelawny launches at the Royal Cornwall Show, which takes place from 9 to 11 June and is the first stage in St Austell's programme of refreshing its core cask-ale range.
By the end of October this year, the core range, available in both bottles and on draught, will include: Trelawny, Tribute, Proper Job, HSD and a new 3.5% ABV beer called Dartmoor Best.
Ales that will be dropped from St Austell's portfolio will include IPA, Cousin Jack and Tinners.
St Austell also plans to launch its 500ml bottled beer Korev on draught this year too. "We are trialling it at the moment in 10 out-lets in Cornwall — we would like it to compete against world beers such as Peroni," Mitchell added.