I read this book back in the 90s, I believe. It was a fantasy novel took place mostly within a city. All I can remember is that there was an assassin that was going to kill a king and there were orphans or street urchins involved in the assassination. I believe it took place during wintertime. I think it had knights and mages and creatures the army fought in a forest. The assassins weren't the main characters. I think the assassins were the children or there were children who witnessed the assassin preparing for the hit, killing a couple of guards and then he murdered them or it could have been the assassin was preparing for the hit and was killed by the children. I just remember them as being a plot point that stuck out.
I think I've read this too - five children witness the murder — I have a feeling its less fantasy and more straight historical — Ken Follet's Pillars of the Earth perhaps.
In a time of civil war, famine and religious strife, there rises a magnificent Cathedral in Kingsbridge. Against this backdrop, lives entwine: Tom, the master builder, Aliena, the noblewoman, Philip, the prior of Kingsbridge, Jack, the artist in stone and Ellen, the woman from the forest who casts a curse. At once, this is a sensuous and enduring love story and an epic that shines with the fierce spirit of a passionate age.
This sounds somewhat like the start of Silverthorn by Raymond Feist. All the items mentioned appear in this novel.
Silverthorn is a fantasy novel by American writer Raymond E. Feist, the sequel to Magician. Released in 1985, it was followed by A Darkness at Sethanon, the final book in The Riftwar Saga.
A year after his brother Lyam's coronation as king, Arutha returns to his city as the new Prince of Krondor, to begin plans for his wedding. Jimmy the Hand, a young thief, foils an assassination attempt on the prince by a fellow thief, and feeling loyalty toward the prince from previously aiding his escape from the city with Princess Anita (in Magician), he chooses to warn the prince of the attempt on his life instead of reporting the traitor to the Mockers, Krondor's powerful and highly organized guild of thieves. Arutha seeks the Mockers' cooperation to obtain more information on the assassins, and at their request, makes Jimmy a squire of his court. Setting a trap, they capture two agents, who are revealed to be operating out of the temple of Lims-Kragma, Goddess of Death, one of whom is a moredhel whose appearance has been altered. During interrogation, both prisoners will themselves to death rather than divulge their plans. As the High Priestess of Lims-Kragma seeks the truth by bringing them back from beyond the grave, one of the prisoners rises by the power of an unknown enemy, and attacks his captors, slaughtering many royal guards, and addressing Arutha as "Lord of the West" before being destroyed by Father Nathan, a priest of Sung.
Assassin's Apprentice by Robin Hobb?