Alahis was the Arian

Arianism

Arianism is the theological teaching attributed to Arius , a Christian presbyter from Alexandria, Egypt, concerning the relationship of the entities of the Trinity and the precise nature of the Son of God as being a subordinate entity to God the Father...

 duke of Trent and Brescia

Brescia

Brescia is a city and comune in the region of Lombardy in northern Italy. It is situated at the foot of the Alps, between the Mella and the Naviglio, with a population of around 197,000. It is the second largest city in Lombardy, after the capital, Milan...

 before becoming king of the Lombards after his successful rebellion in 688. He did not rule long, however.

His first rebellion against King Perctarit

Perctarit

Perctarit was king of the Lombards from 661 to 662 the first time and later from 671 to 688. He was the son and successor of Aripert I. He shared power with his brother Godepert. He was a Catholic, Godepert an Arian. He ruled from Milan, Godepert from Pavia...

 failed, but the king captured, pardoned, and released him. He rebelled again in 688 when Perctarit's son Cunipert

Cunipert

Cunipert was king of the Lombards from 688 to 700. He succeeded his father Perctarit, though he was associated with the throne from 678....

 succeeded. He forced Cunipert to a castle on an island in the middle of Lake Como

Lake Como

Lake Como is a lake of glacial origin in Lombardy, Italy. It has an area of 146 km², making it the third largest lake in Italy, after Lake Garda and Lake Maggiore...

, but his rule was burdensome and tyrannical, and so he lost the support of the people. Finally, in 689, Cunipter issued forth with the men of Piedmont

Piedmont

Piedmont is one of the 20 regions of Italy. It has an area of 25,402 square kilometres and a population of about 4.4 million. The capital of Piedmont is Turin. The main local language is Piedmontese. Occitan is also spoken by a minority in the Occitan Valleys situated in the Provinces of...

 and defeated Alahis and the men of Venetia at the Battle of Coronate

Battle of Coronate

The Battle of Coronate took place in 689, after King Cunicpert returned from exile and ousted Alahis, Usurper King and Duke of Trent, from the capital Pavia.Duke Alahis, fled towards the east, into Austria. There he asssembled an army to march against the king...

, on the Horn of the Adda

Adda River

The Adda is a river in North Italy, a tributary of the Po. It rises in the Alps near the border with Switzerland and flows through Lake Como. The Adda joins the Po a few kilometres upstream of Cremona. It is 313 kilometres long...

, near Lodi. He was defeated and slain in battle.