Piers Corbyn has addressed crowds at a protest against masks, vaccinations and 5G outside Welsh Parliament.
The brother of former Labour leader Jeremy Corbyn addressed dozens gathered on the steps of Welsh Parliament in Cardiff on Sunday.
Mr Corbyn, 73, wielded a microphone in front of a large banner declaring 'End all Covid Vax' and 'Take down 5G'.
Several dozen people appeared to be at the rally, according to images, with other placards reading 'Covid is a hoax', 'Freedom from tyranny' and 'Free your face'.
Piers Corbyn addressed crowds at a protest against masks, vaccinations and 5G outside Welsh Parliament, Senedd Cymru, on Sunday
Officers were seen speaking to demonstrators during the rally outside Senedd Cymru at Cardiff Bay.
It comes after the weather forecaster told his 38,000 Twitter followers on Saturday that police warned him that he could be arrested if he travelled to locked-down Cardiff.
He wrote: 'I'm going. DEFY THEM! GO in huge numbers *£FreeCardiff*'
New coronavirus restrictions came into force in the Welsh capital on September 27 after a sharp rises of cases in the area.
People are not allowed to enter or leave the Cardiff council area without a reasonable excuse, according to the government website.
Residents are also restricted from meeting indoors with anyone who is not part of their household or form an extended 'bubble' without a good reason.
The government guidance allows up to a maximum of 30 people to meet outdoors, but they must all live in the Cardiff council area and social distancing must be adhered to.
MailOnline has contacted South Wales Police for comment.
Several dozen people appeared to attend the rally, with demonstrators brandishing placards reading 'Covid is a hoax', 'Freedom from tyranny' and 'Free your face'
The weather forecaster told his 38,000 Twitter followers on Saturday that police warned him that he could be arrested if he travelled to Cardiff, which is under lockdown measures
Mr Corbyn has recently addressed several similar rallies and was charged under coronavirus legislation over a pre-planned illegal gathering in Sheffield city centre last month.
He was bailed to appear at Sheffield Magistrates' Court in November.
The conspiracy theorist has appeared at rallies in numerous cities across recent weeks, including in Nottingham, Oxford and London.
Mr Corbyn joined anti-lockdown protesters when at least 15,000 demonstrators descended on Trafalgar Square last month.sonos sonos