The Saxon historian Helmold (c. 1125-1177) in the Chronica Slavorum writes that the Slavs believed in one God:
But they do not deny that there is among the multiform godheads to whom they attribute plains and woods, sorrows and joys, one god in the heavens ruling over the others.
They hold that he, the all powerful one, looks only after heavenly matters; that the others, discharging the duties assigned to them in obedience to him, proceeded from his blood; and that one excels another in the measure that he is nearer to this god of gods.

— Helmod, Chronica Slavorum
In the first millennium EC present-day northern and eastern Germany was inhabited by the Saxon and Veneti tribes along with other West Slavic tribes.
The 15th-century Cronecken der Sassen written by Hermann Bote says that the Saxons worshiped a god named Krodo together with the Slavs.
In old records this name appears as Hrodo, Chrodo, Krodo or in Latinized form: Crodone.
Bote also describes that Julius Caesar during the conquest of Germania ordered to build several fortresses topped with statues of Roman deities.
In the place of Harzburg, where later the city of Bad Harzburg was founded in Lower Saxony, a statue of Saturn was supposed to be standing, whose local peoples were to worship as Krodo.

During the Saxon Wars in 780, the Frankish king Charlemagne occupied the region, he destroyed the statue in the effort to Christianise the Saxon people:
... King Charles came to the land and converted the East Saxons.
Thus he spoke: Who is your God?
Then the common folk cried: Krodo, Krodo is our God.
Then King Charles said: Is Krodo your God?
That is: The toad devil! ["
toad" is kroden in Saxon, producing a word-play] Thereafter the word ["Krodo"] became a bad word among the Saxons.
And then King Charles went to Harzburg and destroyed the idol Krodo, and laid down the cathedral in Saligenstidde, now Osterwieck, in honour of Saint Stephen.

— Hermann Bote, Cronecken der Sassen
The chronicle also mentions Krodo's iconography.
The idol was supposed to be on a pole and be barefoot.
He had four attributes that were supposed to represent the four elements:
Water – standing on fish
Earth – bucket of flowers
Fire – wheel as symbol of sun
Air – fluttering linen belt
Bothe himself considered Krodo as the god of the Saxons – he was assigned to the Slavs first time by Georg Fabricius in 1597 in the posthumous Originum illustrissimae stirpis Saxonicae libri septem.

Krodo is also mentioned by Widukind of Corvey – Saxon chronicler and Christian monk.
He writes that the Saxons were to get a metal statue of Saturn from the Polabian Slavs.

In the Cathedral of St. Simon and St. Jude (built in 1047), which was part of the Imperial Palace of Goslar, an altar was found, which in about 1600 was called Altar of Krodo.
This altar was probably made in the 11th century and is entirely made of bronze.
The altar is currently in the museum in Goslar.

Even in the nineteenth century  by German researchers Krodo was considered the chief deity of the Slavs.
Modern scholars of Slavic mythology question the existence of Krodo.
The Saxon historian Helmold (c. 1125-1177) in the Chronica Slavorum writes that the Slavs believed in one God:
But they do not deny that there is among the multiform godheads to whom they attribute plains and woods, sorrows and joys, one god in the heavens ruling over the others. They hold that he, the all powerful one, looks only after heavenly matters; that the others, discharging the duties assigned to them in obedience to him, proceeded from his blood; and that one excels another in the measure that he is nearer to this god of gods.
— Helmod, Chronica Slavorum
In the first millennium EC present-day northern and eastern Germany was inhabited by the Saxon and Veneti tribes along with other West Slavic tribes. The 15th-century Cronecken der Sassen written by Hermann Bote says that the Saxons worshiped a god named Krodo together with the Slavs. In old records this name appears as Hrodo, Chrodo, Krodo or in Latinized form: Crodone. Bote also describes that Julius Caesar during the conquest of Germania ordered to build several fortresses topped with statues of Roman deities. In the place of Harzburg, where later the city of Bad Harzburg was founded in Lower Saxony, a statue of Saturn was supposed to be standing, whose local peoples were to worship as Krodo.
During the Saxon Wars in 780, the Frankish king Charlemagne occupied the region, he destroyed the statue in the effort to Christianise the Saxon people:
... King Charles came to the land and converted the East Saxons. Thus he spoke: Who is your God? Then the common folk cried: Krodo, Krodo is our God. Then King Charles said: Is Krodo your God? That is: The toad devil! ["toad" is kroden in Saxon, producing a word-play] Thereafter the word ["Krodo"] became a bad word among the Saxons. And then King Charles went to Harzburg and destroyed the idol Krodo, and laid down the cathedral in Saligenstidde, now Osterwieck, in honour of Saint Stephen.
— Hermann Bote, Cronecken der Sassen
The chronicle also mentions Krodo's iconography. The idol was supposed to be on a pole and be barefoot. He had four attributes that were supposed to represent the four elements:
Water – standing on fish
Earth – bucket of flowers
Fire – wheel as symbol of sun
Air – fluttering linen belt
Bothe himself considered Krodo as the god of the Saxons – he was assigned to the Slavs first time by Georg Fabricius in 1597 in the posthumous Originum illustrissimae stirpis Saxonicae libri septem.
Krodo is also mentioned by Widukind of Corvey – Saxon chronicler and Christian monk. He writes that the Saxons were to get a metal statue of Saturn from the Polabian Slavs.
In the Cathedral of St. Simon and St. Jude (built in 1047), which was part of the Imperial Palace of Goslar, an altar was found, which in about 1600 was called Altar of Krodo. This altar was probably made in the 11th century and is entirely made of bronze. The altar is currently in the museum in Goslar.
Even in the nineteenth century  by German researchers Krodo was considered the chief deity of the Slavs. Modern scholars of Slavic mythology question the existence of Krodo.
Rod (Slavic religion)