Rocks D. Xebec was a pirate who roamed the seas One Piece during the Rogers era. He was the captain of the Rocks Pirates, which was arguably the strongest crew of its time. He had total control over his pirate crew, which had strong pirates like Big Mom, Kaido and Shiki. He was a pirate whose fear consumed the world, and he performed some of the most absurd feats of strength in the entire series, such as being able to kill a navy admiral when he was a young pirate, destroy a gate of justice single-handedly, and besiege Marijoa to capture 5 kings.
Also, in addition to all such feats, he was on par with the titans of the time in terms of strength. He was not a pushover; his legacy was such that even the World Government wanted to erase it, as his name was a threat they could not ignore. There are only a few characters who are of this man's caliber and have earned his respect and admiration.

One Piece: 8 strongest characters of all eras
These characters defined their generations and stood out as the strongest.
5
Gol D. Roger
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Rank: Captain
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Devil Fruit: Nope
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Haki: Yes
Roger was the king of the pirates who achieved this title by conquering the Grand Line. He was a powerful individual whose strength was a level that only a few people could reach. He was a user of Advanced Conqueror's Haki, which only a handful of people have demonstrated in the series. Roger constantly fought Whitebeard and Garp, two of the strongest characters in the series. Furthermore, he achieved these feats without a Devil Fruit and while sick with an illness. There's no indication that it affected his strength, but it's still impressive.
4
Monkey D. Garp
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Rank: Vice Admiral
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Devil Fruit: Nope
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Haki: Yes
Grap is the strongest fighter the marines have to offer. He kept the marines in the race for dominance during the old pirate era along with Sengoku. Garp had monstrous strength through his hard training sessions. His Haki was on par with Roger and can destroy mountains as well as an island with one hit. He helped Roger beat Domi-Reversed Xebec, and even in his older days, Garp was able to fight Aokiji. It took most of the Blackbeard Pirates to capture him.

One Piece: 6 Strongest Marines of the Old Generation, Ranked
The new generation of Marines is strong, but it can't compare to these old generation legends in One Piece.
3
White beard
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Rank: Captain
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Devil Fruit: Yes
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Haki: Yes
Whitebeard was once an orphan who wanted nothing more than a family for himself and to give those like him a place to call home. This became a driving force that made him the man he was. Whitebeard's strength was on par with Rogers and Garps, both of whom respected his power. He was an advanced Haki user and had a powerful Devil Fruit that could destroy the world. Additionally, he is one of the few characters to defeat an Admiral and do so in three hits.
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2
Harald
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Rank: King
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Devil Fruit: Nope
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Haki: Yes
Harald was the just king of Elbaf who wanted a better life for his people. He was a capable individual whose strength was recognized by Imu herself. Harald was a friend/rival of Xebec himself. It was stated by the Rocks that if they joined forces they would be unstoppable. He clashed on several occasions with the Rocks, and all their battles ended in stalemate, which really says a lot about Harald. He was a phenomenal Haki user on top of all that. Also, he is the only one who was granted opposition from the Holy Knights.

7 Users Of God Level Haki in one piece
These haki users in One Piece are the greatest. Some would even describe their haki as god level.
1
Sengoku
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Rank: Inspector General
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Devil Fruit: Yes
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Haki: Yes
Sengoku is a famous marine who is known for his battle tactics and skillful leadership. He made sure the marines won Marineford's war against the Whitebeard Pirates. He is also a very capable fighter who has served as a Vice Admiral during the Rock's era. His Devil Fruit is a mythical zoan that allows him to transform into a golden Buddha, possessing offensive powers that rival Whitebeard's Gura Gura no Mi. Not much is known about his powers, but Roger has said that only Grap and Sengoku were capable of fighting him and his crew. This makes Sengoku one of the few whose strength is respected by the Pirate King.
- Release date
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October 20, 1999
- Network
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Fuji TV
- Directors
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Hiroaki Miyamoto, Konosuke Uda, Junji Shimizu, Satoshi Itō, Munehisa Sakai, Katsumi Tokoro, Yutaka Nakajima, Yoshihiro Ueda, Kenichi Takeshita, Yoko Ikeda, Ryota Nakamura, Hiroyuki Kakudou, Takahiro Imamura, Toshihiro Ma Shihi Endo, Toshihiro Ma Shihi Endo, Kadota, Sumio Watanabe, Harume Kosaka, Yasuhiro Tanabe, Yukihiko Nakao, Keisuke Onishi, Junichi Fujise, Hiroyuki Satou
- Author
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Jin Tanaka, Akiko Inoue, Junki Takegami, Shinzo Fujita, Shouji Yonemura, Yoshiyuki Suga, Atsuhiro Tomioka, Hirohiko Uesaka, Michiru Shimada, Isao Murayama, Takuya Masumoto, Yoichi Takahashi, Momoka Toyoda
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Mayumi Tanaka
Monkey D. Luffy (voice)
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Kazuya Nakai
Roronoa Zoro (voice)