In January 1753 he was already a huge star in London as the press noted: "Just arrived in this city, from Ireland, the youth, mentioned lately in the newspapers, as the most extraordinary production in nature.
He is allowed by the nobility and gentry, who daily resort to see him, to have the most stupendous and gigantic form (altho' a boy), and is the only representation in the world of the ancient and magnificent giants of that kingdom.
He was sixteen years of age the 10th of last March and is to be seen at the Peacock, at Charing Cross, from eight in the morning, till ten at night."
After touring England the young Magrath did short stints throughout all of Europe, but in Flanders he was forced to return to his native Ireland as his health rapidly began to decline.
Other notable giants whose bodies were stolen and later preserved were Charles Byrne and Daniel Mynheer Cajanus.