By this time he had become a
Huguenot, through the influence of his brother, d'Andelot. The first letter which
John Calvin addressed to him is dated
September 4, 1558. He busied himself secretly with protecting his co-religionists, a colony of whom he sent to
Brazil, under the leadership of his friend and navy colleague, Vice-Admiral
Nicolas Durand de Villegaignon, who successfully established the
France Antarctique colony in
Rio de Janeiro, in
1555. They were afterwards expelled by the Portuguese, in
1567. Coligny also was the leading patron for the failed French colony of
Fort Caroline in
Spanish Florida lead by
Jean Ribault in
1562
On the death of
Henry II he placed himself, with
Louis, Prince of Condé, in the front of his sect, and demanded religious toleration and certain other reforms. In
1560, at the
Assembly of Notables at
Fontainebleau, the hostility between Coligny and
François of Guise broke forth violently. When the civil wars began in
1562, Coligny decided to take arms only after long hesitation, and he was always ready to negotiate. In none of these wars did he show superior genius, but he acted throughout with great prudence and extraordinary tenacity; he was "
le héros de la mauvaise fortune."
In
1569 the defeat and death of the Prince of Condé at the
Battle of Jarnac left him sole leader of the Protestant armies. Victorious at the
Arnay-le-Duc, he obtained peace with the
Peace of Saint-Germain (
1570). Marrying Jacqueline de Montbel, Countess d'Entremont, and returning to the court in
1571, he grew rapidly in favour with
Charles IX. As a means of emancipating the king from the tutelage of his mother and the faction of the
Guises, the admiral proposed to him a descent on
Spanish Flanders, with an army drawn from both sects and commanded by Charles in person. The king's regard for the admiral, and the bold front of the Huguenots, alarmed
Catherine, Queen Mother; and the
massacre of St Bartholomew was the consequence.