Saint Francis of Sales was a popular French saint born in the 15th century France. Here are few of his verses on the managing anger.

Passage

If it be possible, never permit yourself to become angry; never
open the door of your heart to this passion under any pretext what,
ever. You may not be able to drive it away, neither can you control
it at will; but should it happen to take possession of you, hasten and
gather your forces to preserve your peace of heart, gently, without
violence, as it is important not to increase the wound, but soothe it.

The remedies against anger are, first, to prevent it, if possible, or
to occupy the mind with thoughts which tend to allay
the movements of the heart when excited; second, to imitate the apostles, who, in the time of tempest, had recourse to God, to Whom it belongs to
give peace to the heart; third, to do nothing, to say nothing, during
the time the heart is agitated, relating to that which gave rise to
anger; fourth, to oblige ourselves to make acts of sweetness and humility
towards those for whom we feel sentiments of anger.

Abbe Lasausse translated by James O’Brien. Short Meditations for Every Day of the Year. Benziger Brothers, 1890.