David Albaladejo (better known by his stage name King Syze) is an underground rapper from Philadelphia, Pennsylvania of Puerto Rican descent. He is a member of underground hip hop supergroup; Army of the Pharaohs, having featured on all their studio albums. He is known for his frequent collaboration with AOTP members; OuterSpace. Outside of rap, Albaladejo works as a member of trade union which has inspired the names of many of his studio albums.

Many have likened the witty aggressive flow and opposing mic presence of King Syze to that of Big Pun. King Syze has been featured on notable albums by Jedi Mind Tricks' Visions of Gandhi, Vinnie Paz's God of the Serengeti, 7L & Esoterics DC2: Bars of Death and OuterSpace's Blood and Ashes, Blood Brothers, God's Fury, and My Brother's Keeper as well as prominent features on the current smash full-length Army Of The Pharaohs' The Torture Papers. He released his first full-length album Syzemology in 2006 and features appearances from fellow Pharaohs Vinnie Paz, 7L & Esoteric, OuterSpace, Reef The Lost Cauze, Des Devious as well as verses from Sabac Red (of Non Phixion), Pumpkinhead & Block McCloud as well as production from DJ 7L, Jon Doe, Block McCloud, Louis Logic, Crisis Center and Archrival.

In 2008, King Syze released his second studio album The Labor Union. The album was known for "Syze lacing his relentless, rapid-fire flow over a slew of spine-tingling gutter tracks" It contained production from Team 707, DJ Waxwork, Skammadix, and MTK. The album was considered an underground cult classic. On October 4, 2011, King Syze released his third studio album Collective Bargaining. It was entirely produced by Skammadix and featured Vinnie Paz, Ill Bill, Celph Titled, Esoteric, Planetary and Crypt the Warchild of OuterSpace, Baby Blak, Burke The Jurke, Doap Nixon, Kev Turner, Side Effect, Blacastan, V-Zilla, OuterSpace, Diabolic, Jus Allah, King Magnetic, Reef the Lost Cauze, Apathy, Chris Webby, Lawrence Arnell, Rockie Reyes, Poynt Blanc, M-Dot, and featured cuts by DJ Kwestion.

Syze is confirmed to be on the upcoming Army of the Pharaohs albums In Death Reborn slated for an April 22, 2014 release. On 28 January 2014, Syze announced that he was working on his fourth studio album titled Union Terminology. Just like his previous album, Collective Bargaining, it will be produced entirely by Skammadix and will incorporate a diverse array of topics such as daily struggles, and working as a trade union member and will be available for free download. It was officially released 25 March 2014.