Agnes zu Sayn-Wittgenstein was born 18 April 1568 in Kreis Wittgenstein, Germany to Ludwig I. zu Sayn und Wittgenstein (1532-1605) and Elisabeth zu Solms-Laubach (1549-1599) and died 22 April 1617 Heidelberg, Germany of unspecified causes. She married Johann Albrecht I. zu Solms-Braunfels (1563-1623) 12 May 1590 in Braunfels, Germany.
Children
| Name | Birth | Death | Joined with |
| Friedrich Kasimir zu Solms-Braunfels (1591-1595) | |||
| Elisabeth zu Solms-Braunfels (1593-1637) | |||
| Ursula zu Solms-Braunfels (1594-1657) | 24 November 1594 Braunfels | 23 August 1657 Prague, Czech Republic | Christoph II. zu Dohna (1583-1637) |
| Konrad Ludwig zu Solms-Braunfels (1595-1635) | |||
| Juliana zu Solms-Braunfels (1597-1599) | |||
| Johann Albrecht II. zu Solms-Braunfels (1599-1647) | 2 June 1599 | 23 September 1647 Braunfels, Hesse, Germany | Anna Elisabeth von Daun-Falkenstein (c1615-1706) |
| Amalia zu Solms-Braunfels (1602-1675) | 1602 Braunfels, Germany | 1675 The Hague, Netherlands | Frederik Hendrik van Oranje (1584-1647) |
| Amalia zu Solms-Braunfels (1603-1675) | |||
| Friedrich zu Solms-Braunfels (1604-1605) | |||
| Johann Philipp zu Solms-Braunfels (1605-1609) | |||
| Ludowika Christina zu Solms-Braunfels (1606-1669) | |||