Mezue ahịrịokwu na-esonụ: Johannes Jacobus Posthumus (24 Septemba 1887 na Gouda <unk> 12 Disemba 1978 na Utrecht) bụ onye Dutch gymnast onye mpi na 1908 Summer Olympics. Ọ bụ akụkụ nke ndị otu egwuregwu mgbatị ahụ Dutch, nke mechara nke asaa na
ihe omume otu. N'asọmpi ndị mmadụ n'otu n'otu, ọ gbara onye nke iri isii na isii.