Want some quick and easy idea seeds for worldbuilding? Here you go, a random dynasty generator!

Origin: How this noble house came to prominence.
Species: What race makes up this noble house.
Age: How old this line is.
Fortunes: How well off this dynasty is.
Characteristics: Roll twice.

Origin: (1d20)
1: Draconic Blood. This house was founded by a dragon, and its members bear marks of its draconic legacy.
2: Conquerors. This house was founded by a great conqueror.
3: Merchants. This house came to prominence through business and wealth.
4: Ancient. This house traces its lineage back to the previous cycle of empires in this world. (Age automatically becomes Ancien Regime)
5: Founders. This house was founded by the first king of a region.
6: Religious. This house was founded by a notable prophet or holy man, and has a long history of piety.
7: Bandits. This house originated as the nomadic gang of a warlord.
8: Warriors. This house originated from loyal warriors of a ruler, and were granted titles as a reward.
9: Criminal. This house originated as a criminal syndicate, and has ties to the underworld.
10: Divine Mandate. This house has blood from a powerful Celestial. Many of their notable members are Aasimar.
11: Infernal Mandate. This house has blood from a powerful Fiend. Many of their most notable members are Tieflings.
12: Heroic Founder. The founder of this line was a great hero of the local populous.
13: Elemental Blood. This line has ties to the elemental planes, which still influences some of its progeny.
14: Magical Heritage. This line has a long history of magic use, and has sired countless wizards and sorcerers.
15: Loyal Servants. This house originated from a loyal servant of a ruler being granted a title.
16: Feytouched. This line contains the blood of the Fair Folk, giving rise to many eccentric and powerful figures.
17: Crusaders. This line was founded by a great warrior of a God.
18: Legend-steeped. This line claims to trace its origins back to a figure of legend, such as King Arthur, Hercules, or Gilgamesh.
19: Industrious. This line was founded by the owners of some kind of industry or craft, be it mining, plantations, or smithing.
20: Adventurer. The founder of this line was a great adventurer who carved his own path with sweat and blood.

Species (adjust probability as needed). 1d20
1-10: Human/Area Dominant Race (aka what the average person in the area is)
11-12: Half-Elf.
13: Elf
14: Dwarf
15: Halfing
16: Gnome
17: Half-Orc
18: Orc
19: Monstrous (Goblin, Hobgoblin, Gnoll, ect)
20: Unusual (Drow, Diopsid, Hadozee)

Age: (1d20)
1: Upstart. This house is less than a generation old.
2-5: Young. This house is a few generations old.
6-15: Established. This house has been around for generations, and is well established in titles and prestige.
16-18: Old. This line has been around for hundreds of years.
19: Very Old. This line traces itself back a thousand years or more.
20: Ancien Regime. This line seems to have been around since the dawn of civilization.

Fortunes: (1d10)
1: Near-Extinction. This line is down to a handful of individuals...or less.
2: Waining. The coffers are empty, the manor is crumbling, and the land is unworked. This line is in serious trouble.
3: Decaying. Complicancy and decadence is rotting this house from the inside out.
4: Declining. Although not in serious trouble, there are problems developing which threaten the future prosperity of the line.
5-6: Stable. The line is not in decline, but is also not expanding. The titles are secure, but the lands are only breaking even.
7: Climbing. Recent developments have increased this line's prosperity, although how this will play out in the long run is unknown.
8: Prospering. This line is prospering and powerful.
9: Waxing. This line is growing very powerful. The coffers are full, the lands are prosperous, and the vassals are happy. Even a crisis is unlikely to keep them down for long.
10: Golden Age. This line is at the height of its power and influence.

Characteristics: (2d30)
1: Tainted Legacy. Genetic disease, horrific rites, or supernatural taint mars this lines blood.
2: Inbred. In an effort to maintain the purity of the bloodline, the members of this dynasty marry close kin.
3: Curse. A dark curse lingers over this family.
4: Ill-Repute. This family has a dark and unsavory history, much of which is confined to rumors.
5: Unfavored. This line has fallen out of favor with the ruler.
6: Madness. Insanity runs in the family, and this line has produced a multitude of ‘eccentric’ rulers.
7: Succession Crisis. The family is currently facing a power struggle in leadership.
8: Cultists. This family is deeply involved in an underground religion, secret society, or movement.
9: Impailers. This family is infamous for past (or present) cruelty.
10: Coin Flip of Birth. This family seems to produce polar opposites.
11: Decadent. This dynasty is infamous for extravagance.
12: Spiders. This dynasty has connections everywhere, and is known for scheming.
13: Great Wealth. This dynasty has great treasure and wealth, either in gold, land, or men.
14: Martial Heritage. This line often produces great warriors.
15: Good-Repute. This line is famed for its honor.
16: Good Standing. This line is favored by the current rulership.
17: Patrons. This family is famous for patronizing the arts, and has produced grand monuments.
18: Adventurous Legacy. This family has produced a vast amount of adventurers.
19: Strategic Asset. This family has control over something valuable, such as a productive iron deposit or an important fortress.
20: Artifact. This family holds a priceless artifact.
21: Outstanding Manor. This family possesses a palatial estate.
22: Scholarly Heritage. This family has sirred countless scholars.
23: Bankers. This family is noted for moneylending.
24: Physical Characteristic. This family has some unusual physical characteristics, such as left-handedness, a distinct jaw, or white hair.
25: Strange Custom. This family has some strange rite or custom.
26: Activist. This family has pet issues that they often pester their liege about.
27: Zealous. This family has raised a line of holy warriors.
28: Craftsmen. This family are noted to be excellent craftsmen, and unlanded sons traditionally take up their family trade.
29: Humble. Despite their noble birth, this family is humble about their status and treats their underlings well.
30: Naval Tradition. This line has raised many great admirals and explorers.