Scores of faithful have arrived in St Peter’s Square for the canonisation of Britain’s Gen Z saint Carlo Acutis, the son of a Kensington banker.

Acutis, a 15-year-old London-born computer whiz who died in 2006 of an acute case of leukemia, is being declared the first millennial saint today. 

Known as ‘God’s Influencer’ and an enthusiast for video games, Acutis taught himself the basics of coding and utilized it to record miracles and aspects of the Catholic faith online.

Sunday marks the first canonization ceremony conducted by Pope Leo XIV. Images from Vatican City depict hundreds of pilgrims camping in tents and sleeping bags, eagerly waiting to enter the venue for the much-anticipated event.

Numerous devotees have also been seen in Rome with banners and posters celebrating the young Saint, affectionately known as the ‘Little Buddha’. Many made their journey to the capital aboard a special train from Assisi.

Acutis’s body, dressed in jeans and Nike shoes, rests in a glass-enclosed tomb in Assisi, attracting hundreds of thousands of visitors annually.

His canonization, originally scheduled for April but delayed after the death of Pope Francis, will also be broadcast on large screens in Assisi, a historic city and pilgrimage center in the central Umbria region.

The teenager, born on May 3, 1991, to an Italian mother and a father who was half-English and half-Italian, remained deeply faithful, even though his parents were not particularly religious.

Pilgrims of blessed Carlo Acutis from around the world are sleeping in the open outside St. Peter’s Square, queuing to enter for the Canonisation Ceremony of Acutis and Pier Giorgio Frassati at The Vatican on September 7, 2025 in Vatican City

A woman holds a picture of Carlo Acutis on the day Pope Leo XIV leads a Holy Mass for the canonisation of the British-born teen, in St. Peter’s Square at the Vatican, September 7, 2025

A woman holds a figure and a tapestry depicting Carlo Acutis on the day Pope Leo XIV leads a Holy Mass for the canonisation of the 15-year-old, in St. Peter’s Square at the Vatican

Pope Leo XIV gestures as he arrives to lead a Holy Mass for the canonisation of Carlo Acutis

Carlo Acutis, who died of leukaemia in 2006 aged 15, will be raised to sainthood by Pope Leo XIV in a solemn ceremony in St Peter’s Square at the Vatican today

He grew up in the northern city of Milan, where he attended mass daily and had a reputation for kindness to bullied children and homeless people, bringing the latter food and sleeping bags.

In Milan, he took care of his parish website and later that of a Vatican-based academy where he spread the message of Catholicism.

At age 11, he read captivating stories about wine turning to blood in Croatian castles and how in Colombia priests stopped approaching tsunamis by holding up reliquaries. 

He would then up these tales and posting them on his website, which he had designed to document miracles and stories about saints. 

Antonia Salzano, his mother, said her son had a ‘special relationship’ with God from an early age, even though her family was not religious.

Aged seven, Acutis wrote: ‘My life plan is to be always close to Jesus’.

It was a commitment he would carry with him throughout his life before it was cut short by cancer of the blood in 2006.

Carlo’s diagnosis with leukaemia in October 2006 came as a horrifying shock.

The disease can take several forms but affects the blood cells in bone marrow.

Symptoms include tiredness, bruising and bleeding, repeated infections and high temperatures, per Blood Cancer UK.

The disease overwhelmingly affects young people. While it is not currently curable, it is possible to treat.

In spite of his diagnosis, Carlo reassured his parents: ‘I’m happy to die because I’ve lived my life without wasting even a minute of it doing things that wouldn’t have pleased God.’

Carlo Acutis died on October 12, 2006.

People gather on the day Pope Leo XIV leads a Holy Mass for the canonisation of Carlo Acutis, in Rome, Italy, September 7, 2025

Many travelled to the capital to celebrate the occasion via a special train from Assisi

Pilgrims pray and pay their respects at the tomb of Blessed Carlo Acutis in March

A child looks at the tomb of Carlo Acutis, who died of leukemia in 2006 aged 15, in the Shrine of the Stripping of Church of Santa Maria Maggiore in Assisi, Italy, April 10, 2025

The remains of Blessed Carlo Acutis lay in his tomb on March 18, 2025 in Assisi, Italy

In Catholicism, saints are defined as people in heaven who lived righteous lives and used their faith to help others, and in order to become a saint, the individual needs two miracles verified after their death. 

The Vatican has recognised Acutis as performing two miracles himself since his death – a necessary step on the path to sainthood. 

The first was the healing of a Brazilian child suffering from a rare pancreatic malformation, the second the recovery of a Costa Rican student seriously injured in an accident.

In 2012, the Brazilian boy suffering from a rare pancreatic disorder named Mattheus Vianna visited Carlo’s grave in Assisi.

Mattheus, who struggled to keep food down and was seriously underweight, claims to have placed his hand on one of Carlo’s relics in church and said: ‘I wish I could stop vomiting’.

To his amazement, the act completely cured him, and the boy was able to eat normally again, leaving doctors in disbelief.

In 2014, medical tests confirmed the boy’s complete healing and in 2020, the Vatican accepted the incident as a miracle attributed to Carlo and announced that the teenager would be beatified – a crucial step on the path to sainthood.

Then, in 2022, a young Costa Rican student called Valeria Valverde suffered a critical head injury after getting into a cycling accident in Florence.

Her anguished mother travelled to Assisi and prayed to his tomb.

Carlo Acutis pictured smiling at the camera while sporting an AC Milan home kit from the 1990s

Souvenirs and mementos of the Blessed Carlo Acutis for sale in a shop in Assisi, March 18

After her visit, Valeria began to breathe on her own and make a full recover, a result which was later recognised by Pope Francis as the second miracle needed for Carlo’s canonisation.

In both cases, relatives had prayed for help from the teenager, who was named ‘venerable’ in 2018 before being declared ‘blessed’ in 2020.

It was the London-born teenager’s final wish to be buried in Assisi, the home of his 13th-century idol Saint Francis, who dedicated his life to the care of the poor.

Canonisation is the result of a long and meticulous process, involving an investigation by the Vatican and specialists who assess whether the obligatory miracles have taken place.

Final approval rests with the pope.

Italian Pier Giorgio Frassati, a mountaineering enthusiast who died in 1925 and was known for his social and spiritual commitment, will also be made a saint on Sunday.

His casket is inscribed with the words ‘Verso l’alto’ (‘To the heights’), a phrase he wrote on a photograph taken of him looking up to the summit while mountaineering.

An engineering student who made it his mission to serve the poor and sick of his city, he was held up by the Church as a model of charity after his death of polio aged 24.

He was beatified by John Paul II in 1990.

The Vatican recognised the necessary second miracle to put him on the path to sainthood in 2024, with the unexplained healing of a young American man in a coma.