Combining history with my experiences playing as this realm in CK2, and in the interests of providing a very unique set of NI's, I present for your consideration:
LOMBARDY
Traditions: +1 Leader Shock, +1 Merchant
1. The Iron Crown of Lombardy: +1 yearly Legitimacy
"From time immemorial, the Iron Crown has been used to crown the kings and queens of Lombard Italy. This mighty reminder of our history and traditions can be re-emphasized to strengthen our rule. Whoever wears the Iron Crown rules Italy."
2. Ducal Power Broken: +5% Tax Modifier, +10% Loyalty of Nobility Estate
"From the time that our people migrated into Italy, our dukes have remained a constant thorn in the side of our kings. They have attempted to control the royal succession for centuries. But now, the tables have at last turned. As royal cannons destroy the once-vaunted ducal castles, so too have the once-powerful dukes been reduced to subservience to the royalty at long last."
3. Lombard Tactics: +20% Infantry Combat Ability
"The men of Lombardy have been some of the finest warriors that Europe has ever seen. Centuries ago, we faced the Byzantines at the height of their power and defeated them. As our army developed, we have united our fighting spirit with the discipline of Rome's legions. However, in this new age of pike and shot, new military methods are called for. By channeling Lombard militarism into new doctrines, we can ensure that our footmen are the terror of Europe once again."
4. Papal Cooperation: +1 Papal Influence, +10% Loyalty of Clergy Estate
"In the past, Lombardy has been in competition with the Papacy for power in the Italian Peninsula, yet we have also served as its shield from other powers. The rise of Protestantism has shaken Christendom. Now, new enemies beyond the Alps turn their eyes to the Papacy. We must do what we can to support the Holy See."
5. Roman Infrastructure: -10% Development Cost
"The Lombards arrived in Italy when the ruins of Rome were freshly toppled. Our adopted homeland is strewn with the remains of a world-conquering empire. With the world taking a renewed interest in all things classical, we can make use of the architectural principles of the finest remaining Roman buildings and roads in Italy to improve our own infrastructural projects."
6. Pompeian Counter-Piracy: -33% Enemy Privateering Effectiveness, +10% Trade Steering
"The dreaded Corsair pirates from Barbary have been a constant plague of the long Italian coastline, launching terrible raids on villages and plundering our shipping. We must deal with them once and for all. Drawing further lessons from antiquity, we can use the sea patrol system developed by the great Roman general Pompey to effectively combat the Corsairs. With our sea lanes clear, merchants will be more eager to trade at our ports."
7. Industrial Guilds: +5% Goods Produced Modifier, +10% Loyalty of Burghers Estate
"The Guild System is a cornerstone of production in Italy. However, with the concept of mass production being introduced, we must make sure that the guilds adapt to the system while adopting some of its methods. We will see a modest increase in our production, while at the same time earning the gratitude of the powerful Italian merchants for safeguarding their privileges."
Ambitions: -20% Culture Conversion cost