The 1 line. The French King Henry III had no heirs. The pretenders to the throne were Henry Navarre de Vendôme and Henry, duke of Guise of Lorraine. D'Guise had the greatest popularity among the people. By order of the king, he was killed. Henry de Vendôme became the only pretender to the throne, after the killing of the king.

The 2 line. Before his death the king announced his successor de Vendôme, but neither the people nor the nobility not wanted such a king. Paris was closed to him. Five years he fought for the throne. In 1590 in the battle of Ivry la Bataille he won a decisive victory over the superior forces of the enemy. This victory helped him to gain supporters and in the future to become king Henry IV.

The 3:line. In 1590 Pope Gregory XIV was elected.

The 4 line. Presumably, the two leaders are the two main enemies of Henry of Navarre: Carl of Lorraine and his ally Spain. They were defeated.

Linkage with other quatrains: 9.50, 9.45.

Decoding of the number 10.18. 1000-18=982. If to flip 2 in 5, then by swapping these numbers we will get 589+1=590 – the year of events.

Quatrain 4.73 Ferrara

Le nepueu grand par forces prouuera,

Le pache fait du c?ur pusillanime:

Ferrare & Ast le Duc esprouuera,

Par lors qu'au soir fera la pantomine,

Noble nephew will prove by force

A sin committed by a petty heart

He will test Ferrara and the Duke of Este,

When the pantomime will take place in the evening.