After his father's death, Harvey became Lord of Léon.

His fief was the castle of La Roche-Maurice.

Harvey married Anne of Kemenet,[1] heiress of part of the Kemenet-Héboé, that is to say two thirds of the old castle of Hennebont, the parishes of Inzinzac and Penquesten, most of Saint-Caradec and Caudan, half of Groix, one third of Plouay, Tréfaven en Ploemeur and several enclaves scattered in Arzano, Gestel and Lesbin, Quéven and Lanvaudan.

Herve II and Anne had a son: After Anne's death, he married a daughter of Morvan, Viscount of Le Faou.

According to the necrology of the Abbaye Saint-Guénolé de Landévennec, Herve II died on 23 November in an unspecified year around 1218, while he was on his way back from the Fifth Crusade.