Horses Weeping For Their Masters

In three stories, two ancient and one not so much, the horses were aware that their masters were soon to meet their ends.

In Shakespeare's Play, Julius Caesar, The horses belonging to Caesar wept because they knew his death was drawing nigh.  This was a sign, along with many others that foretold Caesar's death in the Senate.

Achilles' horse Xanthus, foretold Achilles' death.  Xanthus was not a normal horse, he was an immortal horse and he spoke aloud.

The Gray of Macha

Cu Chulainn's horse, the Gray of Macha, knew his master would die if he rode out to battle that day and refused to be hitched to the chariot until Cu Chulainn came and spoke to him. The Gray submitted in tears of blood:  "Cu Chulainn went to him. And thrice did the horse turn his left side to his master....Then Cu Chulainn reproached his horse, saying that he was not wont to deal thus with his master.
Thereat the Gray of Macha came and let his big round tears of blood fall on Cu Chulainn's feet. And then Cu Chulainn leaped into the chariot, and drove it suddenly southwards along the Road of Midluachar."  (An Anthology of Irish Literature, vol. I, by David Greene)
In this case, I'm not sure if the Gray was foretelling the future, he may have just been aware of the circumstances.  Other events foretold the death of Cu Chulainn, and the Gray could have been privy to some of them.

But why horses? I have several ideas, which are merely speculations:
Perhaps because they are man's "second" best friend.  Like dogs, horses are man's companion more so than most other creatures. People bond with their dogs and horses, and this bond is celebrated in many stories.
Mythology about Cu Chulainn, and Greek mythology are steeped in omens and prophecies, so why not have the horses involved?  
Additionally, animals have a keen sense of the approach of danger. Their senses are much keener then ours. A dog knows when someone is approaching before a person does. They also can supposedly sense when someone is good or bad. People can sometimes tell too.  Nothing really has to happen, but certain people make us uncomfortable: it's either women's intuition (if you're a gal) or else a fine reading of body language, tone, and the eyes.  There are also stories from WWII were the fighter pilots knew who wasn't coming back just before a flight. If people and animals have such keen senses, then why not exaggerate in a story and make the horses cry or talk? Mayhap these legends were born from an exaggeration of the amazing abilities of animals coupled with the horse's tendency to freak at things they perceive as threats.

Cu Chulainn and Achilles: Famous but Dead

Cu Chulainn (pronounced "Coo Chullen," ch as in loch) is the greatest hero in Irish lore. He is from the Ulster cycle of Irish lore/mythology and has some surprising similarities with Achilles, the Greek hero. In fact, David Greene's An Anthology of Irish Literature calls him "the Achilles of the Ulster cycle."

Both Achilles and Cu Chulainn were sons of a god and a royal human. Thetis (goddess) and Prince Peleus (mortal) were Achilles' parents. Cu Chulainn's mother was Deichtire, sister to King Conchubar. Some say his father was Lug, the Celtic god of light, while others say his father was an Irish chieftain.

Cu Chulainn

At any rate, he was not a normal human. The Boyhood Deeds of  Cuchulain says, "Now the stripling who by the time seven years were completed since his birth, had done such deeds: had destroyed the champions by whom two-thirds of the Ulstermen had fallen unavenged." 

Both had special horses.  As a wedding gift, Peleus and Thetis received two immortal horses named Balius and Xanthus. They came to be Achilles' horses.  Xanthus spoke to Achilles before his death. 

Cu Chulainn was found as a baby by the men of Ulster, and as they were taking him home, they heard a horse whinnying nearby. They stopped to check it out and found a mare who had just dropped her foal.  They took the newborn  horse, saying he was meant for the special baby.  The Gray of Macha, as the horse came to be called, served the warrior well in battle and was cognizant on an almost human level. Born the same day, they died the same day.

And now, moving on to the most important part. The greatest similarity between the warriors is their mindset and their fates.

In History 261, I learned that Achilles had a choice. He could become the greatest and most renowned warrior ever and live a short life, or live a peaceful, normal, and long life.  He chose renown and died in the Trojan War.  The funny things is, Cu Chulainn had the same choice.

When Cu Chulainn was just seven years old, he heard Cathbad the Druid tell his pupils that whoever took up arms that day would become the greatest warrior ever but lead a short life. Immediately he took up arms.

Cu Chulainn explained,  "For when they asked him what special virtue lay in this day, he told them that the name of whatsoever youth should therein for the first time take arms, would top the fame of all Erin's men; nor thereby should he suffer resulting disadvantage, save that his life must be fleeting short."

Cathbad confirmed his words, "noble and famous indeed thou shalt be, but transitory, soon gone."

"Little care I," said Cu chulainn, "nor though I were but one day or one night in being, so long as after me the history of myself and doings may endure."  The quotes are from The Boyhood Deeds of Cu Chulainn.

And so, the great Greek warrior Achilles and the great Celtic warrior Cu Chulainn faced the same decision, made the same choice, and died young but are still remembered today.

Sources:

The Cu Chulainn stories (except the story of Cu Chulainn's birth) are from David Greene's An Anthology of Irish Literature, vol. 1 
James Hunter's Achilles article
Thetis and Peleus
Xanthus
The picture of Cu Chulainn was cropped by Edana A. Click on the caption to see the original.