MP Jo Cox was remembered and prayed for across the country at Sunday church services.
The mother-of-two was killed in a street attack in her Batley and Spen constituency in West Yorkshire on Thursday.
Thomas Mair has left Westminster Magistrates' Court in a police convoy.
Mair appeared in court charged with the murder of MP Jo Cox. He also faces charges of grievous bodily harm, possession of a firearm with intent to commit an indictable offence, and possession of an offensive weapon.
He gave his name in court as "Death to traitors, freedom for Britain", and remained silent when asked to state his address and date of birth.
Deputy Chief Magistrate Emma Arbuthnot ordered that Mair be remanded in custody until his next appearance at the Old Bailey on Monday. He will be held at Belmarsh Prison.
Rev Paul Knight said the Labour MP was a 'fervent advocate for the poor and oppressed'.
Plans are also underway to establish a body tasked with ensuring local police respond swiftly to threats against MPs.
Prayers are expected to be said for MP Jo Cox at church services across the country on Sunday.