Biography
Johann III. von Sponheim-Starkenburg was born circa 1315 to Heinrich II. von Sponheim (c1292-1323) and Loretta von Salm (c1291-c1345) and died 30 December 1398 of unspecified causes. He married Mechthild von der Pfalz (1312-1375) 30 September 1331 JL .
Children
| Name | Birth | Death | Joined with |
| Johann IV. von Sponheim-Starkenburg (c1338-1411) | |||
| Mechthild von Sponheim-Starkenburg (c1345-c1407) | 1345 | 1407 | Rudolf VI. von Baden-Baden (c1346-1372) |
| Loretta von Sponheim-Starkenburg (c1347-c1364) | 1347 | 1364 | Heinrich III. von Veldenz (c1333-1389) |