NEW YORK - At one point during the 14-month, $100 million production of HBO's new series Rome, actor James Purefoy, who plays Mark Antony, was introduced to a group of Italian extras undergoing rigorous boot-camp training to portray Roman soldiers.
The cameras weren't rolling, and on any other set, the moment would have consisted of behind-the-scenes chitchat. But months of immersion in a painstakingly detailed re-creation of the ancient city had its effect. As he stood in a replica of the Forum - constructed to scale at the renowned Cinecitta Studios in Rome - Purefoy addressed the men not as himself but as the famed Roman commander. They, in turn, stood sharply at attention, facing him with respectful awe.
"There he was in the Forum, bellowing at these soldiers, and the whole thing was entirely real," recalled Bruno Heller, writer, co-creator and executive producer of the series. "It was a very strange moment. Everyone felt a shiver."
HBO is feeling its own nervous shiver in the days leading up to tonight's premiere of Rome. The premium-cable channel spent seven years developing and producing what may be the most costly 12-episode television series ever, striving to create a portrayal of the Roman Empire so grittily authentic that the city's ancient inhabitants would have recognized it. The key question, though, is will contemporary audiences embrace this vision?
"Everyone is on tenterhooks to see how it is received," Heller said.
The large-scale project comes at a key juncture for the network, which has recently had trouble duplicating the water-cooler buzz it generated with such shows as The Sopranos, Sex and the City and Six Feet Under.
With 27.7 million paid subscribers, HBO is highly profitable and still commands the largest audience of pay-cable channels. But its growth has slowed in the last two years as programs like the now-canceled Carnivale and the Lisa Kudrow comedy The Comeback struggled to draw viewers.
The most talked-about recent addition to the HBO lineup, Entourage, has gotten critical acclaim but modest ratings. The finale of Six Feet Under last Sunday commanded almost 4 million viewers, far short of the 13.4 million who watched The Sopranos at its peak in 2002. The hit mobster drama, which averaged 12.9 million viewers last season, is now expected to end its run in 2007.
Meanwhile, the network must compete with a similar brand of edgy dramatic programs now found on basic cable and network television.
"They were kind of the undisputed leader in the late '90s in terms of quality television, and I don't think they are anymore," said John Landgraf, president of FX Networks, which has made its mark with such contemporary-themed shows as Rescue Me and Nip/Tuck.
HBO needs "a series that has long legs to it and generates a kind of buzz, excitement and ratings that The Sopranos did," said Jack Myers, editor of mediavillage.com, a television fan Web site. "Anything less than exceptional performance has to be considered under-performance."
Early reviews of the series have been mixed; critics have admired its look and intelligence, but some question whether it has the kind of genre-busting writing and attitude of The Sopranos, or its western Deadwood, or the compelling quality of the famed 1970s Masterpiece Theatre series I, Claudius.
HBO executives acknowledge that they no longer have a monopoly on the kind of original programming that first distinguished the channel in the 1990s but reject the notion that their fortunes will rise or fall on the success of Rome.
"I don't think it's fair to put the burden on this show and say this show has to be the next Sopranos, because nothing could really wear that mantle," said Carolyn Strauss, president of HBO Entertainment.
That said, Rome is "something that we think very, very highly of," she added. "We expect that it will be very successful."
It remains to be seen whether HBO can do for ancient Romans what it has done for mobsters, cowboys and undertakers. Rival studio executives wonder whether television viewers have an appetite for another swords-and-sandals epic, noting the poor ratings that ABC earned for its recent miniseries Empire.
Co-produced with the BBC, Rome features all the usual players: Julius Caesar, Pompey Magnus, Mark Antony. But the series also revolves around two soldiers: the severe Lucius Vorenus and his unlikely comrade-in-arms, the garrulous Titus Pullo. Through them, viewers are given a glimpse into the rough-and-tumble life of the plebian class.
To convey everyday details, Heller said he wanted to get away from the "kitsch pastiches" of helmets and swords that have been used to signify the ancient world in other productions. Instead, the producers sought to create a more fully realized version of Roman life, circa 52 BC.