Puente de la Cárcel (Bridge of the Prison) spanning the Ega River in Estella, Navarra (Spain)

A noble woman pilgrimaged to Santiago to pray for the life of her husband, wounded at war. He was sick when reaching Estella and in the hospital of pilgrims was diagnosed with abortion. Her maid accused her of causing the abortion to herself and was brought to trial. The resolution of the case was conducted by "the test of the water". The defendant  had to be thrown into the river in a metal shield, with her hands and foot tied. If she was guilty he would sink. If not, God would save her. Asked by the brothers of the lady, a squire proposed a way to save her sister's life. He would offer the metal shield of his master, but then he would change it for one of wood simulating metal. So, the lady was taken down by his brothers over the "metal" shield "from the bridge to the river Ega and sank, but soon rose to the surface and sailed at the mercy of the waters towards an island in the river. During the confusion, the squire changed again the shield. In this way the lady's innocence was proclaimed  and could continue her pilgrimage.

Legend of Estella