The final plan of the dome was accepted in 1777, and it was completed in 1790. It was designed to rival those of St. Peter's Basilica in Rome and St Paul's Cathedral in London. Unlike the dome of Les Invalides in Paris, which has a wooden framework, the dome is constructed entirely of stone. It is actually three domes, one within the other, with the painted ceiling, visible from below, on the second dome. The dome is 83.0 metres (272 ft) high, compared with the tallest dome in the world, St. Peter's Basilica at 136.57 metres (448.1 ft). The dome is capped by a cross. However, a statue of Saint Genevieve was initially supposed to sit at the top of the dome. A cross was put temporarily in 1790. After the transformation into a mausoleum in 1791, it was planned that the cross would be replaced by a statue representing Fame. The project was however abandoned. Between 1830 and 1851, a flag was put instead. The cross returned after Louis-Napoleon Bonaparte restored the building to church use. The cross was replaced with a red flag during the Paris Commune in 1871. A cross returned subsequently. Looking up from the crossing of the transept beneath the dome, the painting by Jean-Antoine Gros, the "Apotheosis of Saint Genevieve" (1811–1834), is visible through the opening in the lowest cupola. The triangle in the center symbolizes the Trinity, surrounded by a halo of light. The Hebrew characters spell the name of God. The only character seen in full is Saint Genevieve herself, seated on a rocky promontory. The groups around the painting, made during the Restoration of the Monarchy, represent Kings of France who played an important role in protecting the church. To the left of Saint Genevieve is a group including Clovis, the first King to convert to Christianity. The second group is centred around Charlemagne, who created the first universities. The third group is centred around Louis IX of France, or Saint Louis, with the Crown of Thorns which he brought back from the Holy Land to place in the church of Sainte-Chapelle. The last group is centred around Louis XVIII, the last King of the Restoration, and his niece, looking up into the clouds at the martyred Louis XVI and Marie-Antoinette.