They occupied all posts of importance in the city government, possessed various lordships in the vicinity and played a leading role in the history of the Sticht (Prince-Bishopric of Utrecht).
The ancient ancestral castle of the Zoudenbalchs still dominates the Oudegracht running through the city centre and the facade of their gothic palace continues to stand proudly in the Donkerstraat.
This changed radically in the 15th century when the Zoudenbalchs took a leading role in the various partisan struggles which continually rocked the political and religious life of Utrecht.
Following their usurpation of the comtal rights to Holland the Burgundian dynasty aimed to place a client Prince-Bishop in the see of Utrecht, with the intent of consolidating their territorial grasp on their Netherlandish domains.
The simmering party feud between the anti-Burgundian and largely aristocratic "Lichtenbergers" and the pro-Burgundian "Lokhorsten" broke out again with renewed intensity and civil war loomed.
Although Johan later reconciled himself with the Burgundian party and at one time acted as Councillor to David of Burgundy (he was cited as such in 1459), this alliance between the Zoudenbalchs and the Zuylen van Natewisches pre-figured and certainly influenced Gerrit's key anti-Burgundian stance in the Utrecht Civil War over twenty years later.
Over the following years David's authoritarian style of government and his attempts at centralisation (which constantly undermined the Sticht's legal particularities) led to ever-worsening conflicts with local church notables, the aristocracy and the patriciate.
By the last quarter of the 15th century the two parties -commonly known as Hooks- were acting with one accord in resisting Burgundian hegemony with political guile and occasional violence in both territories.
The unexpected death of Duke Charles the Bold in 1477, who was succeeded by his young and inexperienced daughter Maria, opened the floodgates of latent anti-Burgundian sentiments in the Netherlands.
He and his army then sought refuge in the Sticht where they stood under the protection of the energetic and ferocious Viscount January of Montfoort, leader of the anti-Burgundian forces in the bishopric.
The Viscount, with the support of the Zoudenbalchs and other anti-Burgundian notables, then effectively staged a coup in the city government of Utrecht, ejecting the pro-Burgundian regents from their offices and thus ensuring that the council was fully committed to the Hook cause.
In order to secure finances to fund Hook mercenaries to counter the Habsburg forces, Gerrit Zoudenbalch barricaded all monasteries, convents and religious institutions in Utrecht and refused to allow any clergy to leave until they had handed over their treasures.
Despite some initial military successes under Viscount January of Montfoort (most notably at the Vaart) the Hooks of Utrecht were well aware of the weakness of their position and they thus sought an alliance with King Louis XI of France, the arch-enemy of Maximilian – but ultimately all to no avail.
The fortunes of war favoured the belligerent parties in turn without either side gaining the upper hand, but it was clear that the military might of the Burgundian-Habsburg forces would ultimately prevail.
Pope Sixtus IV then intervened in the conflict and placed the population of the Sticht under an interdict, forbidding any church services to be held until they would allow their Prince-Bishop to freely enter Utrecht.
The bellicose diplomacy of Gerrit Zoudenbalch managed to prevent a compromise being reached during negotiations at Werkhoven in the autumn of 1482 but the tide of popular opinion was turning against the ultra-Hooks.
The Treaty of Arras (1482) between Louis XI and Maximilian ruled out the possibility of any foreign support for the Hook party and further sapped morale in the beleaguered Sticht.
With the peace party in power, the Prince-Bishop could safely re-enter Utrecht; he speedily returned in triumph to settle in his old episcopal palace in the city together with his partisans.
Shortly thereafter the inconsidered action of a party of Maximilian's troops broke the truce and in reaction January of Montfoort's Hook militants re-commenced hostilities with their besiegers.
For financial, political and economic reasons it was in the interest of both Maximilian and David of Burgundy to effect a lasting reconciliation with their adversaries, and their moderate post-war policies reflected this need.
His brother, Evert Soudenbalch, wisely chose to effectuate a reconciliation with the Prince-Bishop, and continued to be one of the most prominent clergymen in Utrecht until his death twenty years later.
Evert Zoudenbalch played a prominent role in the Utrecht Civil War, but his lasting fame is due to an act of charity which continues to resound to this day.
Having retained his office of provost of the Dom after losing his episcopal title in 1466, Gijsbrecht van Brederode appointed Evert as his Socius and Officius as a reward for his support in the struggle with David of Burgundy.
He accompanied his brother on his embassy to the Archduke Maximilian in September 1481 as the representative of the First Estate of the Sticht and was amongst the most prominent of the Hook leaders who were captured during the coup d'état of 21 April 1483.
There is little doubt that Evert used his influence as Procurator of the Dom to engage talented architects and artisans from the cathedral in order to build his own gothic gem.
In the early 16th century the island was plagued by pirate raids led by guerilla leaders from the Duchy of Gueldres, Karel van Gelder and Grote Pier.
Little mention is made of their engagement in the internecine struggles of the Dutch Revolt but the Zoudenbalch's marriage politics clearly indicate that their loyalties lay with the Spanish Habsburgs rather than with their rebellious compatriots.
Various images of the chapel have survived in the work of the well-known Dutch painter, Pieter Saenredam, who painted and sketched the interior of Sint Marie on numerous occasions.
It retained objects from the original foundation of Evert Soudenbalch, including the monumental portal on the Springweg portraying the Zoudenbalch arms supported by two orphans.
Nonetheless, Dom-Canon Evert Soudenbalch made a considerable contribution to the later period of construction in his long tenure as Procurator (fabrieksmeester) of the Dom, in which he helped supervise these building activities.