|St. Eligius with hammer, from REME Museum|
On the death of Clothar, his son Dagobert became King of the Franks. Dagobert (c.603 - 19 January 639) appointed Eligius his chief councilor. Dagobert is considered the last king of the Merovingian line to wield any real power on his own. After him came the weak kings that allowed the Mayors of the Palace to establish the Carolingian dynasty.
Dagobert and Eligius became very close, and it is said that Dagobert relied in Eligius heavily—sometimes exclusively—for advice. With Dagobert's help (i.e., money) Eligius established several monasteries, purchased and freed slaves brought into Marseilles, sent servants to cut down the bodies of hanged criminals and give them decent burial.
In 642, the goldsmith and councilor became a cleric when Eligius was made Bishop of Noyon. He undertook to convert the non-Christians in his diocese, and preached against simony in the church. Some of his writings have survived.
But it was the legends after his death that gave him his current reputation. Of course he is the patron of goldsmiths and craftsmen, and is often depicted holding a bishop's crozier in one hand and a hammer in the other. By extension, he is the patron of all metalworkers, which would include blacksmiths. Over time, the skills of the blacksmith evolved into the skills of mechanical engineers. But that is not to say that Eligius was not a problem-solver on a par with engineers. The legend tells that he was once faced with a horse that refused to cooperate with being shod. Eligius cut off the leg that needed shoeing, put a horseshoe on the detached hoof, then re-attached the leg to the horse! The Corps of Royal Electrical and Mechanical Engineers of the British Army have taken Eligius for their patron saint.