Here's some great info. on Caro:
A Wondrous Mixture
When Caro, the source of all this class, first came to the U. S., there were many skeptics. Despite the speed of the Grey Sovereign line and despite Caro’s sire, Fortino II, being a very fast sprinter, breeders looked at his overall pedigree and said, “Grass.” And of course Caro himself ran on the grass, winning the French 2000 Guineas like so many of his tribe. But Caro was something more.
He was less precocious than some Grey Sovereigns, and was only stakes placed at two, and while he won his classic at three, he ran on at four. In fact, he had his best year as a four-year-old and was crowned the champion of his age and sex when he won the Prix Ganay, Prix d’Harcourt, and Prix Dollar and placed in the Eclipse Stakes and Prix Foy.
The majority of his stamina, of course, came to him via his tail-female line (he traces to Black Duchess) and with names like Precipitation, Hurry On, Bachelor’s Double and Solario in the mix, he could hardly have been a mere sprinter. Yet perhaps his most intriguing cross was a double of Nogara via Nearco and Nervesa that occurred in the pedigree of his sire. In fact, *Fortino II is tail-female to Nogara, something well worth noting.
As a matter of fact, *Fortino II was one of the strangest mixes we’ve discussed for a long time. There is *Nasrullah/Grey Sovereign on top, then Man o’ War and Padua come in via Relic, his broodmare sire, to give him some American flavor. Add the German inbreeding to the broodmare Hollebeck via half siblings Olba and Oretello and the Tesio flavor via Nogara, which is Italian, and one has a true international horse.
Grey Sovereign, of course, brings in that Hainault line, so Phalaris x2/Hainault appears overall and Fortino II carries a treble of Havresac II, two from Nogara and one via the German sire Orsenigo. Given the type horse most Germans favor (and the presence of solid Chef Oleander) as Orsenigo’s sire, there was a bit of stamina in Fortino II, too.
So there you have it – a unique *Nasrullah line and one that appears to be hanging on. Cozzene continues to impress, looking young for his age, and with Alphabet Soup a pleasant surprise, and In Excess even more surprising, the line might become the Domino of *Nasrullahs after all, and need only one good one to make it all work.
http://www.reines-de-course.com/grey_sovereign_(gb).htm
also here:
http://www.indiarace.com/stallion/TEJANO/index.htm
PREPOTENT SIRE LINE
By Caro (son of Fortino II) , Champion racehorse, Champion Sire. Sire of sires NEBOS, KALSOUN, RINGARO, COZZENE, CRYSTAL PALACE, RUSTICARO, GALETTO, WITH APPROVAL, DR. CARTER, SIBERIAN EXPRESS, TURGENO etc.
Leading French sire:
http://www.tbheritage.com/HistoricSires ... Sires.html