Geoffrey IV (died August 1190), called the Younger (French Geoffroy le Jeune), was the Lord of Joinville from 1188 until his death on the Third Crusade two years later. He is surnamed Valet by Alberic of Trois-Fontaines.
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Family
Geoffrey was the only son of Geoffrey III the Old and his wife, Felicity (Félicité) of Brienne. His mother's first husband, Simon I of Broyes, died sometime before 1132 and Geoffrey was born to her second marriage before 1141. By 1179, he was assisting his elderly father in the government of Joinville. In Geoffrey III's last years, his son seems to have been exercising the lordship in his father's name. He succeeded to it only on his father's death in 1188.
Sometime before his accession, Geoffrey married Héluis (Helvide), a daughter of the crusader Guy I of Dampierre. They had six sons and two daughters, all listed by Alberic of Trois-Fontaines. The order of the sons is their birth order:
Geoffrey V le Trouillard (died c. 1204), succeeded as lord of Joinville, was an adult in 1188
Robert, lord of Sailly by 1201, accompanied Walter III of Brienne on the Fourth Crusade, but died in Apulia en route to the Holy Land, in 1203; was succeeded in Sailly by his brother Simon
William (died 1226), archdeacon of Châlons (1191), bishop of Langres (1208) and archbishop of Reims (1219)