On 22 May 2017 a suicide bomber detonated a shrapnel-laden homemade bomb as people were leaving Manchester Arena following a concert by the then 23-year-old singer.
Members of the public also watched the proceedings on screen at York Minster, Liverpool Metropolitan Cathedral and Glasgow Cathedral.
A single balloon in the shape of a bee - the emblem of the city which in the wake of the tragedy became a symbol of solidarity - was released into the cloudless sky.
Prince William and Prime Minister Theresa May joined survivors and emergency workers who responded to the attack for a remembrance service at the cathedral.
And DJ Nick Grimshaw also sent love to those affected by the attack, while also praising the One Love Manchester benefit concert, which was organised by Ariana and Scooter shortly after the attack.
Among them was 29-year-old Martyn Hett from Stockport.
Prince William gave a Bible reading, The Gift Of Love, and readings were also given by George Herbert, a student at Chetham's School of Music; Remsha Asif, a student at Whalley Range High School for Girls; Michelle Milner, deputy director of nursing at Royal Manchester Children's Hospital, along with members of the Hindi, Muslim, Sikh and Jewish communities.
We're sure those in Manchester are grateful for Ariana's constant love and support.
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My family, specifically, and a good number of others...well, our drama is broadcasted worldwide through media", she noted. The budding model continued, "As wonderful and as s-tty as things can be, it is no one's business but ours".
They included the Manchester Survivors Choir, made up of people who were at the arena on the night of the fateful concert last May 22, and Parrs Wood High School's Harmony Group, whose post-attack tribute went viral previous year.
"I am learning to control my thoughts and I am still taking anti-depressants but I know I have to keep positive". The singer has paid tribute to victims of the attack, including the youngest, Saffie Roussos, who would have turned 9 last July.
"Today is bittersweet for all of us and the last of the firsts", Ellaway said. Others left hand-written notes on Japanese maples that have been planted to form a "Trees of Hope" trail through the city.
Pauline Thompson (71) was one of hundreds to decorate the trees.
"We are showing Manchester and the world that we carry on", said Cath Day of the Manchester Survivors Choir. "It brings us all closer together".
Grande suspended her Dangerous Woman Tour after the bombing and returned for the One Love Manchester charity concert weeks later, which raised funds for victims of the attack.