After having conquered Italy:

The bloodthirsty black one, red, will be exposed,

Fire, blood shed, water colored by blood.

Perhaps this is a prophecy about the unification of Italy. The revolutionary movement in the south of the country was headed by Giuseppe Garibaldi – the red one. He and his militiamen wore red shirts. Black is Camillo Cavour – the first prime minister of Italy. In all portraits he is dressed in a black suit. This is not the first quatrain, where Nostradamus correctly indicated the color of the clothes. Cavour was the head of the government of Sardinia and played an important political role in the unification of the peninsula. The struggle for a united Italy was accompanied by rebellions, fires, bloody battles. It ended in 1971, when Rome became the capital.

Linkage with other quatrains: 4.77, 5.44, 8.31.

Decoding of the number 6.38. If 6 to flip in 9, 900-83=817, swap 17 in 71, 1 to put in front, then we get 1871 – the year, when Rome became capital of Italy.

Quatrain 5.22 Pope Gregory XVI

Auant qu'a Rome grand ait rendu l'ame,

Effrayeur grande à l'armee estrangere:

Par escadrons l'embusche pres de Parme,

Puis les deux rouges ensemble feront chere.

Before the great one has given up the ghost at Rome,

Great terror for the foreign army:

The ambush by squadrons near Parma,