First Minister Carwyn Jones and Welsh Secretary David Jones will make a joint visit this morning to Royal Navy warship HMS Dragon, which is at Britannia Quay in Cardiff for five days.
The 152m ship will be receive the Freedom of the City on Sunday.
It's open to the public on Saturday - and our reporter James Crichton-Smith is on board now:
On the bridge of HMS Dragon http://t.co/YnoLAM2U33
The helm of HMS Dragon http://t.co/MPFvVue7Pz
The Royal Navy destroyer HMS Dragon has arrived in Cardiff for a five day stay.
It will open for the public and schools around Wales to get a taste of life at sea, and will also receive the Freedom of the City.
Easy does it... http://t.co/RUx0gtBbEO
Royal Navy ship HMS Dragon will sail into Cardiff today for five days. Whilst in the capital it will receive the honour of the Freedom of the City of Cardiff; only the 10th organisation to do so since records began in 1886.
From Thursday hundreds of schools and colleges will be allowed to go aboard the 152-metre ship, and it will be open to the public on Saturday.
A formal ceremony will take place in the city centre on Sunday to mark the confer of the Freedom of the City.
HMS Dragon's Commanding Officer, Captain Rex Cox said: "It's a real honour for HMS Dragon to be awarded the Freedom of the City of Cardiff. I know all of the Ship's Company are especially proud of our links to the city and to Wales. Moments like these are very important in the life of a ship.
"Our friendship and affiliations with organisations across the country, in particular Wales, give a ship an unbreakable link to our society and as sailors come and go, these links will outlast us all and become a part of HMS Dragon's history."
The crew say they are looking forward to welcoming local people between 10 and 4pm on Saturday, talking to them about the ship, her role with the Royal Navy, and more broadly, as part of NATO and allied forces across the world.